Water conditioner sera PH/KH-minus bottle 250 ml – lowers pH and KH

sera PH/KH-minus is a 250 ml water conditioner designed to lower and regulate pH and carbonate hardness (KH) in aquarium and pond water. It is intended for keeping soft and slightly acidic water conditions required by sensitive freshwater species such as discus and angelfish, and for correcting elevated KH or pH caused by natural metabolic processes.

Advantages

The product lowers pH and reduces carbonate hardness quickly and precisely, enabling controlled adjustment of water chemistry. By stabilising KH and pH values, it helps create suitable keeping conditions that support fish vitality and successful reproduction or acclimation.

Suitable for

• Softwater-loving tropical fish (e.g. discus, angelfish)
• Breeding and fry rearing requiring low KH and slightly acidic water
• Acclimation when moving fish between tanks with different water hardness
• Correction of elevated KH or pH in aquaria and ponds

When it may not be suitable

Not all freshwater species require lowered KH or pH; fish that prefer neutral to hard water or species kept in planted tanks with specific substrate buffering may be negatively affected by reducing KH and pH. Excessive or repeated use without testing can destabilise water chemistry.

Key specifications

• Volume: 250 ml
• Function: lowers pH and carbonate hardness (KH)
• Intended use: aquaria and garden ponds with freshwater
• Effect: rapid and precise regulation of pH and KH

How to use

Measure current pH and KH before treatment. Dose sera PH/KH-minus according to the manufacturer’s instructions and the water volume to be treated, then retest water parameters. For establishing stable softwater conditions, first adjust carbonate hardness to about 4°dKH and afterwards use an appropriate peat product in the filter for long-term maintenance. Avoid overdosing and adjust treatment frequency based on regular water tests.

What to consider before purchase

• Check current pH and KH values with reliable test kits
• Ensure the target species require lowered KH and slightly acidic water
• Plan follow-up measures (e.g. peat filtration) for long-term stability

Usage recommendations

Use in combination with regular water testing and, for permanent softwater conditions, adjust KH to about 4°dKH then add peat filter media such as sera super peat to maintain slightly acidic, soft water.