Fish Science pH Reducer 250ml | Freshwater Aquarium pH Control

The FS pH Reducer 250ml is a water chemistry additive for freshwater aquariums, formulated to bring pH down gradually and predictably. It is particularly well-suited to keepers housing soft water tropical species that require lower, stable pH conditions — including tetras, discus, rasboras, and dwarf cichlids — where abrupt water chemistry shifts can cause serious stress.

Controlled pH Reduction

Rather than dropping pH sharply, this product works incrementally, reducing the risk of sudden swings that can harm fish. Gradual adjustment gives livestock time to acclimate and allows the keeper to dial in water chemistry with confidence rather than chasing corrections.

Species Compatibility

• Suited to soft water tropical freshwater species
• Appropriate for tetras, discus, rasboras, and dwarf cichlids
• For use in freshwater aquariums only

Dosing Guide

Add 5ml per 50 litres to reduce pH by approximately 0.1. Test pH daily and continue adjusting gradually until the target level is reached. Precise, measurable dosing means you stay in control of the process at every stage.

Used correctly, the FS pH Reducer 250ml gives freshwater keepers a straightforward, repeatable method for maintaining water conditions that match the natural requirements of soft water species.