“Climbs slowly” is not yet a measurement

You cannot compare a sentence with anything, including the same bottle next week. Two lines and a scale fix that in five minutes.

Before you change a single variable, make the complaint something you can read twice and compare. There are three things worth recording and all three are free. The liquid line: mark the level on the outside of the glass with a fine marker at hour zero, and mark it again at each later reading, so the glass itself carries the history. The wet line: the highest point on each reed that is visibly damp or darkened, measured with a ruler in millimetres from the liquid surface upwards. And the whole-bottle weight, because the line is coarse and the scale is exact.

Do all three at fixed hours rather than when you happen to walk past. A schedule that works: at mixing, at the end of the published 24-48 hours rest, then at 6, 24, 48 and 72 hours after the reeds go in, then daily to day seven. The reason to start the clock after the rest rather than at mixing is that CSI's only published duration in this process sits on the Longevity page — “Rest the blend 24-48 hours before bottling for maximum stability and longevity.” — and a blend still settling is not the blend you intend to sell.

Record the room temperature with every reading, in a single column, because it is the largest uncontrolled variable in an Indian workshop and it moves wicking both ways. You are not trying to establish a temperature coefficient; you are trying to be able to say afterwards whether the slow day was also the cold morning. CSI publishes no temperature tolerance for a diffuser blend, so the only record is the one you keep.

Note the reed count and the fill height too, once, at the start, and then do not change them for the duration. Five reeds in a 100 g bottle is the working assumption on this page — a set of five white reeds is ₹45.00 at the pack-of-50 rate — and if you want to test the reed count that is a legitimate fourth experiment, run separately, not folded into this one.

Finally, write down what “slow” means to you before you measure, because a specific expectation is much easier to test than a vague disappointment. Is the complaint that the wet line has not moved in two days? That the reeds are damp but the room smells of nothing? That the liquid level has barely dropped in a week? Those are three different findings with three different first moves, and only the first of them is really a climb problem at all.

What CSI publishes about wicking, and what it does not

There is published copy about wicking. There is no published number about wicking. The gap between those two sentences is this whole section.

Start with what is there, because it is genuinely relevant. The Pure Performance page puts wicking among its named features — “Smooth, even wicking for fiber reed sticks and wooden cap bottles.” — and elaborates it as “Formulated for optimal viscosity - wicks consistently through fiber reed sticks and wooden cap car freshener bottles without clogging or running too fast.” The Lift page states that “The crystal-clear, stable formula wicks evenly and is designed for both home diffuser and car freshener applications.” Those are published intentions about how the bases are meant to behave in reeds, and they are worth knowing before you suspect the carrier.

Now what is not there, and it is the part that governs your diagnosis. No CSI page publishes a wicking rate, a climb height, a climb time, a viscosity figure or a reed capacity. The white fibre reeds and black fibre reeds publish a product title — “Premium Quality Engineered for fragrance” — and no length, diameter, fibre density or absorption figure. So there is no published figure anywhere against which your millimetres per day could be called normal or slow.

And the constraint that runs through this whole hundred of posts: all of that published wicking copy, like every other published figure in the diffuser range, is written about fragrance oil. Nothing in the catalogue publishes a load, a dose, a compatibility statement, a flash point, a safety data sheet, an IFRA certificate, an allergen list or a shelf life for any essential oil in a diffuser. Your lavender diffuser is outside the published material in two directions at once — no wicking figure for anybody, and no load figure for this oil.

That is less discouraging than it sounds, because the question you can actually answer needs no published figure at all. “Does my bottle climb faster with a fresh reed set than with the old one” is answerable with two bottles and a ruler, and the answer is specific to your blend, your glass and your room — which is more useful than a catalogue average would have been. The absence of a published number is a reason to pair your bottles, not a reason to guess.

One piece of published guidance does transfer cleanly and you will use it on the load step: four of the five base pages tell you what to do when a blend clouds — Lift says “If clouding occurs, the fragrance oil may not be fully compatible at that load - reduce fragrance percentage and retest.”, Softness says “If clouding occurs, the fragrance oil may not be fully compatible at that load - reduce the fragrance percentage and retest.”, Depth says “If any clouding occurs, reduce fragrance percentage and retest before proceeding to batch production.” and Longevity says “The blend should remain crystal clear. If clouding occurs, reduce fragrance percentage and retest. Heavy oils like oud can cloud at maximum load in some bases.” That is advice about a procedure rather than about a material, so it carries over honestly to an oil the pages do not cover — and if your slow-climbing bottle is also hazy, the step-down is where to start.

Three candidates, ordered by what each costs to test

Likelihood is a guess. Test cost is a number. Sort by the number.

Most troubleshooting advice sorts candidates by how likely each one is to be the culprit, which sounds sensible and works badly, because the likelihood is exactly what you do not know. Sorting by what each test costs is better, because those figures are published and you can read them before you start. On this question the three costs are nothing like each other, so the order falls out immediately.

The reeds cost ₹45.00 to change — a set of five white reeds at the pack-of-50 rate. The load costs nothing new at all, because it spends base and oil already on your shelf; a second 100 g bottle at the starting rung is ₹266.26 of material you have already bought. The base costs ₹325.00 at the smallest honest pack, and ₹1,099.00 if the candidate is any base other than the one sold in a 100 g pack. A 500 ml pack is 24.42 times a reed set; the trial pack is 7.22 times it.

There is a second reason the reeds go first, and it is about information rather than money. Reeds are the only one of the three that changes while you are not looking. The base in the bottle is the base you poured. The load is the load you weighed. But the reeds have been standing in a loaded blend for however long the bottle has been in service, and whatever has accumulated in them is not something you chose. Swapping them is both the cheapest test and the one most likely to be testing a variable that drifted.

Then the load, because it is free and because it moves two things at once in a way that is worth seeing. A lower rung puts more base and less oil in the bottle: 10 g of oil into 90 g of base at the starting rung against 20 g into 80 g at the recommended one. That is a different liquid with a different viscosity, not simply a weaker version of the same one, which is why it is a genuine candidate for a climb problem rather than only a throw problem.

The base last, and only once the first two have been read. This is not because the base is an unlikely cause — it is a perfectly plausible one — but because it is the only step that leaves you owning stock you may not want. If the reeds or the load explain the behaviour, you have saved the ₹325.00 or the ₹1,099.00 entirely; if they do not, you have narrowed the question before spending it, and you will be testing the base with a reed set and a rung you have already characterised.

Candidate one: the reeds, at a few rupees a set

Five reeds is the cheapest experiment in this series, and the rate stops improving at the pack of fifty.

Take the old set out, stand a fresh set of five in a second bottle of the same blend, and read both. That is the whole test, and at ₹45.00 for five white fibre reeds at the pack-of-50 rate it is cheap enough that there is no sensible reason to do it second. Do not simply reverse the old reeds in the same bottle, incidentally — a reversed reed is a partly saturated reed, and you have changed two things rather than one.

Read the ladder before you buy, because “buy the biggest pack” is wrong here in a specific way. The pack of 25 is ₹265.00, which is ₹10.60 a reed; the pack of 50 is ₹450.00, which is ₹9.00; the pack of 100 is ₹900.00 and the pack of 500 is ₹4,500.00, both at the same ₹9.00. So the rate steps once, at the pack of 50, and is flat above it: the best rate among the packs this page quotes is ₹9.00 a reed, reached at the pack of 50 and not improved by anything larger. The pack of 25 is 17.78% dearer per reed, which on a set of five is ₹53.00 against ₹45.00 — a difference of ₹8.00.

Black fibre reeds run the same shape of ladder at a lower price: ₹236.00 for 25, ₹400.00 for 50 and ₹800.00 for 100, which is ₹9.44 a reed at the smallest pack and ₹8.00 from the pack of 50 up, with the best rate among those packs at ₹8.00. That is ₹1.00 a reed below white at the same pack size, or ₹5.00 on a set of five — ₹40.00 against ₹45.00. For a diagnosis the colour is irrelevant and either product answers the question; for a finished product it is a decision about how the bottle looks.

How many to buy. The three-step diagnosis on this page runs 3 bottles of 5 reeds, which is 15 reeds: one pack of 25 covers that with 10 to spare, and a pack of 50 leaves 35. Watch the edge case, because it is the kind that bites in production rather than on a bench: 25 reeds is five bottles of five, which one pack of 25 covers exactly, with nothing at all to spare — so one dropped or snapped reed at that point means opening another pack.

One thing this page does not try to settle is which reed material suits you, because a live CSI article already owns that comparison — fibre reeds against natural rattan — and it is a choice about consistency rather than a diagnosis of a slow bottle. Nor does it cover reeds that have gone dark and tacky after a month, which another live page answers, or a formula that clogs reeds faster than another one, which a third does. If your reeds are discoloured or sticky rather than merely slow, start on those pages instead.

Candidate two: the load, which costs no new purchase

Changing the rung spends material you already own — and it changes what the liquid is, not just how strong it is.

CSI's reed and car diffuser base pages state fragrance load as a percentage of the total finished blend: 10% as a starting point, 20% as the recommended working load and 30% as the maximum, with 75% base plus 25% fragrance oil as the typical working blend and a worked example reading — for a 100 ml finished diffuser at 25% fragrance, use 75 ml of base and 25 ml of fragrance oil. In a 100 g bottle that is 10 g of oil with 90 g of base, 20 g with 80 g, 25 g with 75 g, or 30 g with 70 g.

Get the denominator right before you change anything, because the candle convention is the reverse and most Indian diffuser makers arrive from candles. 20 g of oil into 80 g of base is 20% of the total finished blend and 25% of the base weight. Both are honest arithmetic; only the first can be compared with 10%, 20% and 30%, and only the first means the same thing to whoever reads your formula sheet next. The Longevity page publishes a slightly higher band of its own — “The recommended working ratio is 70-75% Longevity Base with 25-30% fragrance oil.” — so quote the band from the base you are using.

Now the test. Mix a second 100 g bottle of the same blend at a different rung and stand it beside the first with a fresh reed set in each. The useful direction depends on your symptom: if the bottle is slow and hazy, step down, which is what four of the five base pages instruct anyway; if it is slow and perfectly clear, trying a rung above tells you whether more oil moves more liquid. Change the rung and nothing else — same glass, same fill weight, same reed count, same shelf, started in the same hour.

Price it so you know what you are spending, even though no new purchase is required. At the 500 ml pack rate a 100 g bottle is ₹197.82 of base and ₹68.44 of oil at the starting rung — ₹266.26 in all; ₹175.84 and ₹136.88 at the recommended rung, ₹312.72; and ₹359.18 at the maximum, where the oil alone is ₹205.32. Stepping up from the starting to the recommended rung adds ₹46.46 to a bottle and from there to the maximum another ₹46.46, because the oil costs more per gram than the base: at the recommended rung the oil is 43.77% of the raw material and the base 56.23%.

Two bottles at the starting and recommended rungs need 30 g of oil between them, which one 50 g pack of lavender at ₹342.20 covers with 20 g left — enough for 100 g of finished blend at the recommended rung. And the pack size costs you nothing extra either way: lavender is the same ₹6,844.00 a kilogram at every pack size its page quotes, so the rate does not improve with size and a 15 g pack at ₹102.66 carries the same rate as the kilogram at ₹6,844.00.

Candidate three: the base, which is the expensive one

Plausible, testable, and the only step that leaves you owning a pack you might not want.

If a fresh reed set and a second rung have both failed to move the readings, the carrier is the remaining candidate and it is a reasonable one. The published copy is on your side as a reason to test rather than as an answer: the Pure Performance page describes itself as “Formulated for optimal viscosity - wicks consistently through fiber reed sticks and wooden cap car freshener bottles without clogging or running too fast.” and its specification line reads “Fixatives: None - clean base, no additives.”, which makes it the neutral comparator. But nothing published tells you how any base behaves with lavender essential oil, because nothing published is about an essential oil at all.

Buy the smallest honest pack. Pure Performance is the only base in the range sold in a 100 g pack, at ₹325.00, and that pack covers exactly one 100 g bottle at the recommended rung: 80 g of base out of 100 g, leaving 20 g. Every other candidate is a 500 ml purchase — ₹1,099.00 for Lift, Depth and Softness alike, ₹1,296.00 for Longevity, which is ₹39.40 per 100 ml above the others at ₹259.20 against ₹219.80.

The 100 g pack is dearer per gram and that is the honest reason it exists: ₹3,250.00 a kilogram against ₹2,198.00 for the 500 ml, which is 47.86% more per gram. Pay it for a diagnosis and do not pay it for production. If you expect to produce in whichever base wins, a 500 ml pack is the better buy on its own terms — it fills 6.25 finished 100 g bottles at the recommended rung, 6 whole ones — but that is a production decision rather than part of this test.

Which base to test against, if you are choosing. CSI's base pages name fragrance families, and classifying an individual oil into a family is CSI's editorial judgement rather than a published fact about the oil. On that classification lavender and ylang ylang are florals and peppermint and marjoram are green, and the Lift page names floral and green among the families it is built for. Lemon is a fresh citrus, which the Lift page does not name — it arrives at Lift only through the Longevity page's own steer: “Light Florals, Fresh Citrus, Aquatics - use Lift Base instead for brightness and airiness.” Those are two different published routes and the second is the weaker one.

There is one more published line worth knowing if your symptom is really about how long the bottle lasts rather than how fast it climbs. The Depth page is the only page in the range that publishes anything about diffusion rate: “Slows evaporation for a longer-lasting scent experience.”, elaborated as “Engineered for a slower, more sustained diffusion rate - letting rich base notes develop and linger rather than evaporating with the top notes and leaving a flat residue.” That is scoped to the families the Depth page itself names and written about fragrance oil, so it is a reason to consider Depth for a sweet or spicy fragrance oil rather than a prediction about lavender essential oil. The Longevity page's climate copy — “Does not evaporate too fast in Indian summer heat or fade too soon in humidity. Consistent diffusion performance across the range of temperatures that Indian homes, offices, and cars experience.” — sits in the same category.

The paired reading, hour by hour

One bottle is an anecdote. Two bottles differing in one thing is a measurement.

Every step above is the same experiment with a different variable in it, so the protocol only has to be written once. Two bottles, identical in every respect except the one thing under test, filled to the same weight, standing on the same shelf in the same room, started within the same hour, with a fresh set of 5 reeds in each. Then both read together at every reading, in the same order, with the readings written down as you take them.

Why both bottles get fresh reeds even when the reeds are not the variable: because a reed set that has been in service is an uncontrolled difference, and the one thing you are testing has to be the only difference. On the reed step itself the paired bottles are old set against new set, which is the one case where the reeds differ deliberately. On the load and base steps both bottles get new reeds out of the same pack.

Readings at fixed hours: at the moment the reeds go in, then 6, 24, 48 and 72 hours, then daily to day seven, then weekly. Take the wet line in millimetres on every reed rather than on one — reeds vary, and an average of five is a much steadier number than whichever reed you looked at. Take the whole-bottle weight at the same time of day each time, because a bottle weighed at 8 a.m. and again at 6 p.m. has had a different fourteen hours.

Photograph the pair in one frame at each reading, with the date on a card in shot and the phone on a fixed mark. Two bottles in one photograph can be compared later; two photographs of one bottle each cannot. If the wet lines are close, the photograph will often settle an argument the eye cannot — and if they are not close, you have your result and the step is over.

Three bottles is where the full diagnosis ends up, and a pack of ten 120 ml gold diffuser bottles at ₹1,062.00 covers 3 of them with 7 left over, at ₹106.20 each. If you would rather run the bench side smaller, the 50 ml pack of ten at ₹826.00 is ₹82.60 a bottle — but keep the diagnostic bottles the same size as each other, since neck diameter and surface area are part of what you are not supposed to be changing.

Five things that look like slow climb and are not these three

Check these before you buy anything, because four of the five cost nothing to rule out.

First, time. A reed that has just gone into a fresh bottle has not finished saturating, and the wet line moves fastest in the first hours and then slows down by design. If your complaint is based on a reading taken a few hours after the reeds went in, take another at 48 and 72 hours before concluding anything. This is also why the readings start after the published 24-48 hours rest rather than at mixing.

Second, reed count and depth of insertion. Five reeds in a 100 g bottle is a working figure, not a published one — CSI publishes no reed count for any bottle — and a bottle with three reeds in it moves less liquid than the same bottle with five. Check how far the reeds actually reach into the liquid, too: a long reed standing in a shallow bottle may be drawing from a few millimetres of blend.

Third, the bottle. Neck diameter and surface area govern how much of what climbs the reed then leaves the room, and a narrow neck with a wide-shouldered bottle behaves quite differently from a straight-sided one. That is a real variable and it is not one of your three; a live CSI page already owns it in the reed count and bottle neck context, and the general systematic comparison across base, load, reeds, geometry and conditions sits on another.

Fourth, the room. Temperature, airflow and humidity all move wicking, and an Indian workshop can swing twelve degrees between a morning and an afternoon. A bottle on a shelf above a cooker, next to an air conditioner, or in a sealed cupboard is not measuring the same thing as a bottle in a hallway. Pair your bottles on one shelf and record the temperature; the live page on Indian weather covers the seasonal version of this question.

Fifth, and most commonly: the complaint is not actually about climb. If the reeds are visibly damp to a good height and the room still smells of very little, the climb is working and what you are reading is throw — a different question with a different first move, and one where a fragrance oil is a legitimate comparator precisely because the published figures apply to it as published. Lavender Fragrance Oil at ₹270.00 for 50 g, British Rose at ₹212.40, Jasmine at ₹230.00 and Woody Oud at ₹271.40 all sit in families the base pages name, so running one of them beside your essential oil bottle separates “this blend does not move” from “this blend moves and does not smell of much”. That comparison carries no implication that either material is safer or better.

What to buy for the diagnosis, and the reed ladder

The whole three-step diagnosis is a small figure. Here it is, step by step, with what each step buys you.

Step one is ₹45.00: one fresh set of five white fibre reeds at the pack-of-50 rate, which is ₹9.7% of one finished unit at ₹463.92. The smallest pack is 25 reeds at ₹265.00, so if you own no spare reeds at all that is the actual outlay, and it covers five sets. Nothing else is needed for step one, because the second bottle is a bottle you already have.

Step two is ₹311.26: a second 100 g bottle at the published starting rung, ₹266.26 of base and oil out of stock you already own, plus a fresh reed set at ₹45.00. Strictly speaking you have already paid for the material; the figure is here so you can see that the load step is cheap rather than free, and so you can decide whether it is worth running a third rung as well.

Step three is ₹506.88: the 100 g Pure Performance trial pack at ₹325.00, 80 g of which goes into a 100 g bottle at the recommended rung with 20 g of essential oil at ₹136.88, plus a reed set. If the base you want to test is not the one sold in a 100 g pack, replace ₹325.00 with ₹1,099.00 and the step becomes the most expensive thing on this page by a wide margin.

All three steps together are ₹863.14, which is 3.72% of the ₹23,196.00 that fifty finished units represent — fifty units are 26.87 times the whole diagnosis. That is the number to keep in view when the paired bottles feel like a detour: the diagnosis costs a small fraction of the run it is protecting, and it is the only thing between you and fifty bottles that climb the way the one on your bench does.

Freight, for completeness and for the bases only, read from the live CSI delivery profile at the stored packed weights: a 500 ml base pack is 1 kg packed and ships Standard at ₹110.00, while the 100 g trial pack is 0.1 kg and ships at ₹80.00 — the heavier pack costs ₹30.00 more to send. Shipping is not quoted on the essential oils on this page.

What each result lets you conclude

Four outcomes, four decisions — and one sentence about what none of them entitles you to say.

If the fresh reed set climbs visibly better than the old one, you have a reed-replacement finding rather than a formula problem. Decide how long a set lasts in your blend by keeping the paired bottles running, write that interval down, and build it into what you tell a customer about replacing reeds. Reeds are ₹9.00 each from the pack of 50 up, so this is the cheapest possible answer to have found.

If both reed sets behave the same and a lower rung climbs better, you have a load finding. Produce at the rung that worked, record the rung above it as the one you tested and rejected, and note the cost consequence — the step from the recommended rung down to the starting rung takes ₹46.46 out of a 100 g bottle, but it also puts 90 g of base in the bottle instead of 80 g, so a 500 ml pack fills fewer bottles. Both legs of that, not just the cheaper-looking one.

If the reeds and the rung make no difference and a second base does, you have a carrier finding about that pair in your conditions — not a general ranking of the two bases. Repeat it once before you buy 500 ml on the strength of a single pair, and when you do, remember that a 500 ml pack fills 6 whole 100 g bottles at the recommended rung, so the purchase is a production decision as well as a diagnostic one.

And if nothing moves the readings at all, the honest conclusion is that this blend climbs at the rate it climbs, and the question becomes whether that rate is acceptable for the product rather than which variable to blame. At that point the levers left are the ones this page sends elsewhere: reed count, bottle geometry, room conditions, and whether the complaint was really about throw. CSI publishes no wicking rate, so there is no benchmark that can tell you your bottle is wrong — only your own paired readings and your own judgement about the product.

The claim boundary, which does not bend on an essential oil page. Nothing in this diagnosis supports a statement about what the finished diffuser does for a person: no therapeutic, medicinal, wellness or aromatherapeutic benefit belongs on your label or in your listing, because CSI publishes none, your readings test none, and the claim is regulated. Nor is an essential oil safer than a fragrance oil on grounds of origin — each formulation needs its own hazard assessment, whatever limits apply to it, its own stability testing and truthful ingredient labelling. The base titles describe the fragrance a base is built to carry rather than an effect on anybody in the room, and “100% Pure” in an oil's title is a purity statement about the oil. CSI publishes no IFRA certificate, no safety data sheet and no allergen list for any of the five stocked essential oils.

Frequently asked questions