Fish Science kH Reducer 250ml – Carbonate Hardness Treatment

The FS kH Reducer is a freshwater aquarium treatment designed to lower carbonate hardness (kH) and support more precise pH control. It's aimed at aquarists keeping soft water species or anyone working to dial in specific water chemistry parameters that standard tap water makes difficult to achieve.

What It Does

• Reduces carbonate hardness (kH) in freshwater aquariums
• Helps stabilise and control pH by removing buffering capacity
• Supports species that require lower mineral content water
• Works with a controlled, gradual action to avoid sudden chemistry swings

Dosing Guide

Dose at 25ml per 100 litres to reduce kH by 2 degrees. Do not reduce kH by more than 1 degree per day to avoid stressing livestock. Adjust accordingly based on your target parameters and current readings.

For keepers who need consistent, repeatable water conditions rather than leaving things to chance, the FS kH Reducer gives you a reliable tool to bring carbonate hardness in line with your species' requirements.