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How to dose active oxygen pool sachets

Updated: 21 October 2026

The pump has been on since Saturday and you are about to tip in a Soft & Easy pouch the way you used to tip in chlorine. How to dose active oxygen pool sachets is a different clock. Bayrol wants the pH set first, both chambers in the water, and an oxygen reading inside one to two hours, not the next morning. Bayrol’s Soft & Easy page and the Lovibond pooltester page were followed on 19 October 2026. This was not a pool test. Which box to buy is on the [active oxygen pool comparison](/hub/pool-care/active-oxygen-pool). A qualifying purchase can earn a commission at no extra cost to you. The steps below are for Soft & Easy.

The pump has been on since Saturday and you are about to tip in a Soft & Easy pouch the way you used to tip in chlorine. How to dose active oxygen pool sachets is a different clock.

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Bayrol Bayrol Soft & Easy, 5.04 kg

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Bayrol Bayrol Soft & Easy, 5.04 kg
8.9/10about £82.50
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Bayrol Bayrol Soft & Easy, 4.48 kg

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Bayrol Bayrol Soft & Easy, 4.48 kg
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On this page
  1. 1.Before the first pouch
  2. 2.Week one and every week after
  3. 3.The two-hour test
  4. 4.Sachets are not the tablet tub

Before the first pouch

Set the pH to 7.0–7.4 before the granules go in. That band is Bayrol’s, and it is tighter than a somewhere-near-7 habit. If the pH is high, the pouch is not the tool that brings it down. Correct the pH, let the water turn over, then open the sachet. A tester that reads oxygen can also read pH, if it is the oxygen version rather than a chlorine strip. Run the pump before you dose and leave it running while the granules dissolve. A still corner is a poor place to judge the mix. The amazon.co.uk listings do not print a gram dose. If a shop page says 280 g or 420 g, that figure stays on the shop page. The label and Bayrol’s size chart win when they disagree. Have the oxygen test in the house before the first pouch.

Week one and every week after

Bayrol’s worked example is sized to 20 m³. The first treatment is two double pouches per 20 m³. After that, one double pouch per 20 m³ each week. The 30 m³ pack is a larger pouch for a larger pool, not a reason to copy the 20 m³ count onto a different box. The 4.48 kg listing says up to 20 m³. The 5.04 kg listings say up to 30 m³. Match the pouch to the volume on the box you opened. Double the weekly pouch when the week is hot or the pool is busy. Bayrol states that increase. The weekly pouch is maintenance for water already in range. It is not a rescue for green water. Green water you cannot clear is a point to call a pool professional, or to use the chlorine shock Bayrol still allows, under the label. If your test inside two hours is under Bayrol’s line, you add a pouch.
Bayrol Bayrol Soft & Easy, 5.04 kg

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Bayrol Bayrol Soft & Easy, 5.04 kg
8.9/10about £82.50
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The two-hour test

Read the oxygen one to two hours after dosing. Bayrol wants at least 8 mg/L. If the reading is lower, add another pouch. Lovibond’s active-oxygen pooltester covers 0–10 mg/L with DPD No. 4, and pH 6.8–8.2 with phenol red. That scale can show the 8 mg/L check. The same hardware is not Bayrol’s method for liquid Bayrosoft. Chlorine strips will not do this. Pool-chem’s guide describes strips for chlorine, bromine, pH, alkalinity, hardness, and cyanuric acid. A zero on a chlorine strip, on an oxygen pool, tells you nothing about the pouch you added an hour ago. Buy the oxygen and pH tester. A clear pool the next morning is not an oxygen reading. If you only test then, a low number does not prove the pouch never worked.

Sachets are not the tablet tub

Relax oxygen tablets print a different dose. The listing says 9 tablets per 45.5 m³ to start and 5 tablets per 45.5 m³ each week, used with Micro-Cide and Clear Tabs. Tablet weight is not stated, and there is no review text. Follow that label. Do not convert one Soft & Easy pouch per 20 m³ into a handful of those tablets. AquaCare names hydrogen peroxide and silver and prints no dose, so this sachet clock is the wrong instruction for that bottle. Choosing the product is the buying guide. Why you might keep chlorine in the shed is active oxygen versus chlorine. Store the box closed, cool, and dry, away from children. The label is the dose.

Common questions

How many pouches in week one?
On Bayrol’s page the first treatment is two double pouches per 20 m³, then one double pouch per 20 m³ each week. The 30 m³ pack uses the larger pouch for that larger volume. The Amazon listings do not print grams per bag, so a shop’s 420 g line stays on the shop page.
When do I test, and what number am I looking for?
Test one to two hours after dosing, with the pump having run. Bayrol wants at least 8 mg/L. If you are under that, add another pouch. Lovibond’s tester reads 0–10 mg/L with DPD No. 4. A reading the next morning is a different question, because the residual is short-lived.
Do I empty both sides of the sachet?
Yes. One chamber is the oxidiser and the other is algae prevention and clarification. Empty both, with the pump on. Using one chamber leaves out the part PoolStore says persulphate needs against algae. The pre-dosed bag is the whole weekly dose for the volume on the pack.
When do I double the weekly dose?
Bayrol says to double the weekly pouch in hot weather or when the pool is busy. That is the same pouch size, used twice, not a new chemical. If the two-hour test is still under 8 mg/L after the normal pouch, add another then as well.
How soon can I swim?
Bayrol says about 15 minutes after the granules have dissolved, with the pump running. Wait until you cannot see undissolved grit. That 15 minutes is the manufacturer’s line for this product. It is not a swimming time for a peroxide bottle or for the Relax tablets. A near-zero reading the next morning does not, on its own, mean the pouch never registered, which is why the two-hour test is the one that decides an extra pouch.

Related pages

Chlorine free above ground pool

Active oxygen pool

Best active oxygen pool treatment for a known size

Active oxygen pool treatment: what the name covers

Active oxygen vs chlorine pool: smell against algae

Sources

Public UK sources from the research digest. Shelf prices and star lines are the amazon.co.uk figures in the display file, scored on 19 October 2026.

  1. Bayrol: Soft & Easy without chlorine (retrieved 19 October 2026)
  2. PoolStore: non-chlorine alternatives (retrieved 19 October 2026)
  3. HSE: biocide product types, product type 2 (retrieved 19 October 2026)
  4. HSE: HSG282, control of legionella in spa pools (retrieved 19 October 2026)
  5. PWTAG: Code of Practice (retrieved 19 October 2026)
  6. All Swim: Bayrol Soft & Easy (retrieved 19 October 2026)
  7. Lovibond: Pooltester active oxygen and pH (retrieved 19 October 2026)
  8. East Renfrewshire Council: legionella FAQs (retrieved 19 October 2026)