Reagent refills

Refills to keep measuring with your liquid drop tests.

-50% on a selection of fish food

A refill replaces the reagent bottles of a drop test when they are empty or out of date, without buying the test tube or colour chart again. Refills exist for every parameter: pH, KH, GH, ammonium, nitrite, nitrate, phosphate, iron, potassium, magnesium, copper, oxygen and CO2. The refills used most in aquaponics are those for the nitrogen cycle parameters, which are checked every week during start-up.

Keep reagents closed, cool and away from light: a reagent that has changed colour gives a false reading. Complete test kits are in Water testing.

Frequently asked questions