Tetra pH/KH Minus liquid 250 ml – Tetra water hardness and carbonate hardness reducer for aquariums

Tetra pH/KH Minus liquid 250 ml is a concentrated aquarium treatment designed to reduce general water hardness (GH) and carbonate hardness (KH) in freshwater aquaria. The formulation lowers the buffering capacity of water to enable gradual pH adjustment and to soften tap water so that conditions better suit soft-water fish species and aquatic plants. The product is intended for regular use during water changes and for conditioning new aquarium water before adding it to the tank.

Advantages

Tetra pH/KH Minus delivers controlled reduction of carbonate hardness and overall water hardness in a liquid form that is easy to dose and distribute evenly in aquarium water. The liquid format enables targeted adjustment of buffering capacity so you can lower pH stability when required, while following the manufacturer dosing instructions helps minimise stress to livestock. The product is suitable for incremental corrections and for preparing replacement water during maintenance.

Suitable for

• Freshwater aquariums requiring softer water and lower carbonate hardness
• Species that prefer low GH/KH and slightly acidic conditions
• Preparing tap water for water changes or new tank setups

When it may not be suitable

This product is not intended for use in marine or brackish aquaria where higher hardness and buffering are required. It may be unsuitable for systems with livestock that require stable, high carbonate hardness or species that tolerate only specific narrow pH ranges; abrupt changes in KH or pH can stress fish and invertebrates.

Key specifications

• Form: liquid
• Volume: 250 ml
• Effect: reduces carbonate hardness (KH) and general hardness (GH)
• Application: freshwater aquaria
• Dosage: follow manufacturer dosing instructions on the label for controlled adjustment

How to use

Use Tetra pH/KH Minus by following the dosing instructions printed on the product label. Measure the current KH/GH and pH of your aquarium water before treatment and calculate the required dose for the desired change. Add the measured dose to aquarium water gradually, preferably during water changes or in small increments, and retest water parameters after treatment. Avoid large single adjustments; if larger changes are needed, perform them over several treatment steps to reduce stress to fish and plants.

What to consider before purchase

• Check that your aquarium is freshwater and that the intended livestock benefit from reduced KH/GH.
• Measure existing pH, KH and GH to determine how much adjustment is needed.
• Confirm you can follow incremental dosing and have test kits to monitor changes.

Usage recommendations

Perform gradual adjustments and monitor parameters with reliable test kits. Use the product during water changes or when conditioning new water, and avoid rapid or repeated large reductions of KH/pH to protect fish, invertebrates and plant health.