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API Water Conditioners & pH

Tap water is made for people, not fish: it carries chlorine, chloramine and traces of metal that burn gills and strip slime coats. API conditioners neutralise all of it in seconds, bottled bacteria get a new filter working, and the pH range holds water where your fish evolved to live. Every bottle on this page is dosed in millilitres per litre, so it is simple to get right.

API Stress Coat

The water conditioner with aloe vera: neutralises chlorine, chloramine and heavy metals and rebuilds the slime coat on stressed or injured fish. 5 ml per 38 litres.

4 sizesFreshwater & marineView details: API Stress Coat

API Aqua Essential

All-in-one conditioner that makes tap water safe and also binds ammonia, nitrite and nitrate in the tank. 5 ml per 200 litres for tap water; 5 ml per 40 litres for a toxin spike.

3 sizesFreshwater & marineView details: API Aqua Essential

API Quick Start

Live nitrifying bacteria that start the aquarium cycle immediately, so fish can go into a new tank the same day. 10 ml per 38 litres, fresh or salt water.

3 sizesFreshwater & marineView details: API Quick Start

API Stress Zyme+

A weekly dose of sludge-eating bacteria — over 300 million per teaspoon — that keeps gravel and filters cleaner and the biological filter strong. 5 ml per 38 litres.

4 sizesFreshwater & marineView details: API Stress Zyme+

API Ammo Lock

Converts toxic ammonia into a harmless form instantly, and dechlorinates too. The bottle to reach for when a test reads ammonia. 5 ml per 38 litres every two days until clear.

2 sizesFreshwater & marineView details: API Ammo Lock

API pH Up

A fast-acting liquid that nudges aquarium pH upward at 1 ml per 38 litres. Colourless, phosphate-free and nitrate-free, so it neither clouds the water nor feeds algae.

2 sizesFreshwaterView details: API pH Up

API pH Down

Lowers freshwater aquarium pH in small, controlled steps — 1 ml per 38 litres — without clouding the water or feeding algae. Test, dose, retest.

2 sizesFreshwaterView details: API pH Down

API Proper pH 8.2

A phosphate-free carbonate buffer that sets and holds pH at 8.2 for marine, brackish and African cichlid aquariums, and raises carbonate hardness as it works. One scoop per 38 litres.

Marine & cichlidsView details: API Proper pH 8.2

Frequently asked questions

Do I need a water conditioner if my tap water is treated with chlorine, not chloramine?

Yes. Chlorine alone is toxic to fish at tap-water levels, and a conditioner also neutralises the copper, zinc and other metals that reach a tap through household plumbing. API Tap Water Conditioner or Stress Coat deals with both in the time it takes to fill a bucket.

What is the difference between API Stress Coat and API Tap Water Conditioner?

Both remove chlorine, chloramine and heavy metals. Stress Coat adds aloe vera to help repair damaged fins and slime coats, which makes it the better choice after netting, transport or illness; Tap Water Conditioner is the concentrated, no-frills option for routine water changes.

Can I add fish straight after setting up a new aquarium?

With API Quick Start you can add a small number of hardy fish the same day, because it seeds the filter with the live nitrifying bacteria that would otherwise take weeks to establish. Stock slowly, test ammonia and nitrite for the first month, and keep a conditioner on hand for water changes.

Should I use pH Up and pH Down, or a Proper pH buffer?

Use the liquids for a small, one-off correction and a Proper pH powder when you want to hold a specific value permanently. The buffers lock pH at 6.5, 7.0, 7.5 or 8.2, which suits tanks kept for a particular fish group; the liquids shift pH gradually and are easier to overshoot with.

Are API water conditioners available in South Africa?

Yes. Jungle Aquatics in Fourways, Johannesburg stocks the API conditioner and pH range and delivers nationwide; live pricing and stock are on jungleaquatics.com.

South African flagAvailable in South Africa

Stocked & supported by Jungle Aquatics

South Africa's leading pet and aquarium store since 2007 — with the API range on the floor in Fourways, advice from people who test water every day, and easy ordering from anywhere in the country.