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Active oxygen pool treatment

Updated: 21 October 2026

You have a garden pool, the chlorine smell is why you are looking, and amazon.co.uk has put active oxygen on sachets, tablets, a 1 litre bottle, and shock that still expects chlorine in the water. Active oxygen pool treatment, on this page, means a product that is itself the weekly care. These listings were sorted on 19 October 2026 from the amazon.co.uk pages, Bayrol’s Soft & Easy page, and UK shop notes. This was not a lab test. Prices sit 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.

You have a garden pool, the chlorine smell is why you are looking, and amazon.co.uk has put active oxygen on sachets, tablets, a 1 litre bottle, and shock that still expects chlorine in the water.

Our top picks

Bayrol Bayrol Soft & Easy, 5.04 kg

Best overall

Bayrol Bayrol Soft & Easy, 5.04 kg
8.9/10about £82.50
View offer
AquaCare AquaCare sanitiser, 1 L

Best value

AquaCare AquaCare sanitiser, 1 L
7.8/10about £13.99
View offer
Relax Relax oxygen tablets, 5 kg

Alternative

Relax Relax oxygen tablets, 5 kg
3.3/10about £116.27
View offer
On this page
  1. 1.What active oxygen means in a UK pool shop
  2. 2.The weekly sachet, the tablets, and the poured liquid
  3. 3.What to leave on the shelf
  4. 4.20 m³, 30 m³, or a small pool

What active oxygen means in a UK pool shop

Those two words cover more than one chemical. PoolStore describes Bayrol Soft & Easy as a persulphate with a quat algaecide in the weekly system, and non-chlorine shock as that oxidiser used only beside a sanitiser you already dose. Hydrogen peroxide, sometimes with silver, is a liquid you pour. The shop name does not tell you which one you are holding. Lighthouse Pools also lists liquid Bayrosoft on a dosing unit. That doser is not one of the five listings kept here. A title that says oxygen can still be a shock tub.

The weekly sachet, the tablets, and the poured liquid

The sachet is the complete weekly box. Bayrol describes a double pouch: oxidiser in one chamber, algae prevention and clarification in the other. In this set that is the 4.48 kg listing for up to 20 m³ at £81.33, and two 5.04 kg listings for up to 30 m³, at £82.50 and £91.50. None of those Amazon files names persulphate or prints a gram dose. You buy the volume claim and the pre-dosed bags, then follow Bayrol for the pouch count and the test. The tablet tub is a different purchase. Relax oxygen tablets, 5 kg at £116.27, say to use them with Micro-Cide and Clear Tabs, which are not in the box. The page prints 9 tablets per 45.5 m³ to start and 5 tablets per 45.5 m³ each week, with no tablet weight and no chemical name. The poured liquid is AquaCare, 1 litre at £13.99. The highlight names stabilised hydrogen peroxide and silver, for pools, hot tubs, and ice baths. No pool volume is printed. A bullet says it breaks down to water and oxygen, which is a breakdown claim, not a dose.
Bayrol Bayrol Soft & Easy, 5.04 kg

Testsieger

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

What to leave on the shelf

Non-chlorine shock is potassium peroxymonosulphate sold beside a chlorine or bromine residual. UK Pool Store’s Blue Horizons shock tells you to hold free chlorine at 1–3 mg/L. That job was removed from this comparison, including aBalchemy non-chlorine shock and a 20 kg Zagosa oxy-shock. A hot-tub-only elixir and a garbled listing that mixed a euro price with an empty-chlorine title came out as well. PoolStore says persulphate is weak on algae unless something else is in the system. Soft & Easy puts that second chemical in the other chamber. A shock tub does not. If the water is already green, Bayrol still says a chlorine shock can be used with Soft & Easy. The label in your hand wins. Weekly steps are on how to dose active oxygen.

20 m³, 30 m³, or a small pool

The 4.48 kg listing says up to 20 m³. Both 5.04 kg listings say up to 30 m³. All Swim’s 12 × 420 g line and the Amazon file’s 16 packs are two sources. Do not copy a shop gram weight onto a page that does not print it. A 20 m³ pool is about 20,000 litres. A paddling pool is a few thousand, so the 30 m³ box is the wrong size, and a 1 litre bottle with no printed volume can be wrong as well. Whether to leave chlorine, including smell and a reserve shock, is active oxygen versus chlorine.

Common questions

What is actually in a Soft & Easy pouch?
Bayrol describes a double pouch: oxidiser in one chamber, algae prevention and clarification in the other. PoolStore names a persulphate and a quat. The amazon.co.uk listings say active-oxygen granules and do not print that name or a gram weight per bag. Follow the pouch marked for your pool on Bayrol’s page, and treat a shop’s 280 g or 420 g line as that shop’s figure.
Do I need a second chemical with oxygen tablets?
On the Relax listing, yes. The bullets say to use the 5 kg tablets with Micro-Cide and Clear Tabs, which are not in the tub. The dose is 9 tablets per 45.5 m³ at the start and 5 tablets per 45.5 m³ each week. There is no review text. A Soft & Easy box is the listing that calls itself complete care.
Is a peroxide bottle the same system as the sachets?
AquaCare, at £13.99 for 1 litre, names stabilised hydrogen peroxide and silver and prints no volume. Soft & Easy is a pre-dosed pouch with a stated 20 m³ or 30 m³ and no chemical name on the Amazon page. Bayrol’s liquid Bayrosoft is a third route, because it belongs on a dosing unit, and that unit is not in this Amazon set.
Which pack size, 20 m³ or 30 m³?
Use the 4.48 kg listing, at £81.33, for a pool up to 20 m³. Use a 5.04 kg listing up to 30 m³. The £82.50 page has 4.6 from 317 reviews and says 16 packs. The £91.50 page is 5.0 from two reviews and has no review text. All Swim’s 12 × 420 g count is a shop page. It does not overwrite the 16-packs line.
Can I use this in a hot tub that I let to guests?
A family tub and a holiday let are different duties. AquaCare’s title includes hot tubs, and some UK reviews describe a top-up. East Renfrewshire’s holiday-let guidance says peroxide alone is not the residual they want, and that line is about lets, not your own frame pool. Soft & Easy’s pages state a pool volume. For a let, follow the local rule and the label.

Related pages

Chlorine free above ground pool

Active oxygen pool

Best active oxygen pool treatment for a known size

How to dose active oxygen pool sachets, week by week

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)