My schedule is demanding and I forget to replace my car freshener. How should I think about replacement frequency and reminders?

I could print an interval and you would probably believe it. It would be invented, and the first time it was wrong you would stop believing anything else on this page. The marker pen is slower and it is yours.

The answer, in full

I have to answer the second half first: there is no reminder. SOSA publishes no reminder service, no subscription, no app and no prompt of any kind, so if something is going to nudge you it will be a repeating entry in your own calendar. On the first half, no replacement interval is published for anything in the range either. What is published is four quantities, and they are all of it. A 10ml spray is 100 sprays, stated as three months and above at one spray a day and fifty days at two a day. A 50ml at ₹1,509 is 500 sprays, stated as about a year and more. A spray combo is 200 sprays. A 12ml hanging bottle is 4 to 6 weeks, that is 28 to 42 days, of continuous diffusion. Only the last of those four is expressed in time, which makes the hanging bottle the one format whose published figure you can put straight into a calendar. For Safar's 20ml bottle there is no published figure at all, so the number has to be yours: mark the level with a marker pen, note the date, drive your ordinary month, and read the mark. A portion of every SOSA order supports girl-child education through Nanhi Kali.

The four published quantities, and how to turn one into a date

A quantity is not an interval, and the difference matters for somebody who forgets. Three of the four are counts and one is a window, so only one of them goes into a calendar without arithmetic.

The one window: 4 to 6 weeks on a 12ml hanging bottle

This is the only published quantity already expressed in time: 4 to 6 weeks, that is 28 to 42 days, of continuous diffusion from a refillable glass bottle whose stopper loosens for stronger and tightens for subtler. For somebody with a demanding diary that is the useful property, because you can write the hanging date down and let the published window do the rest. 15ml refills are ₹399 to ₹449 across eight scents, and eight of the nine scents come in this format.

Write the hanging date down. The window is published.

The three counts: 100, 200 and 500 sprays

A 10ml spray is 100 sprays, stated as three months and above at one spray a day and fifty days at two a day. A spray combo is 200 sprays. A 50ml at ₹1,509 is 500 sprays, stated as about a year and more. These are counts, not dates, so a bottle lasts exactly as long as your own rate of pressing makes it last. If your pressing is irregular, the published figures still hold; what moves is where you land inside them.

The published blank: Safar's 20ml bottle, and the marker pen

For Safar nothing on this subject is published. No oil-consumption rate exists, so no refill interval and no running cost can be derived from the ₹1,049 for 100 gm or the ₹1,849 for 300 gm. No charge duration is published either. The method that gives you a real number is to mark the oil level on the 20ml bottle with a marker pen on day one, write the date beside the mark, drive your ordinary month, and read the mark at the end. That figure will be true for your driving and for nobody else's.

Your own mark is the only interval that will ever be true.

A scent choice that survives being forgotten

Eight of the nine car scents come as a 10ml spray or a 12ml hanging at the same price per scent, from Jasmine ₹459 up to Sea Breeze ₹519, and Mysore Orange Blossom ₹559 is a spray only. SOSA publishes no strength ranking of the nine car scents, so there is no strongest one to reach for and no ladder to climb. So there is no scent that stretches a bottle further, and the choice is yours on smell alone.

If the thing you keep forgetting is the re-order rather than the fitting, the 15ml hanging refills at ₹399 to ₹449 are the cheapest way back to a full bottle. See the 15ml refills →

What is published about replacement, format by format

For a diary that is already full, the published shape of the 12ml hanging bottle is the kindest of the four: one action, a date written down, and a window of 4 to 6 weeks to work against. That is a description of what the record says rather than a promise about how it will feel. SOSA publishes no ranking of the formats by how much work they feel like, so that part of the decision is yours.

“Four published quantities, no published interval, and no reminder. The date you write on day one is the only schedule that will ever exist for you.”

Four habits that beat a reminder nobody sends

1. Write the date on the day you hang a bottle or open a spray. One line, one time.
2. Put a repeating entry in your own calendar at the published 4 to 6 week window.
3. For Safar, mark the oil level with a marker pen and note the date beside it.
4. Re-order the 15ml refill at Rs 399 to Rs 449 before the bottle is empty.

Questions, answered