Fritz pH Higher reduces acidity and raises pH in freshwater aquariums, and it boosts KH (carbonate hardness) at the same time for a more stable, better-buffered system. Adjust gradually to keep your fish comfortable. Explore more water care.Features Raises pH in freshwater aquariums Increases KH (carbonate hardness) for better buffering and stability Helps hard-water species like African cichlids and livebearers Best used in small, gradual steps Pairs with pH Lower and pH Neutralizer for full control Choose Your Size 4 oz for smaller tanks 16 oz for larger tanks and better value How to Use Test pH and KH before and after dosing Do not change pH by more than 0.2 units in 24 hours with livestock present As pH rises above 6.0 ammonia becomes more toxic, so keep ammonia in check first Add slowly and retest after several hours Specifications Brand Fritz Type pH increaser and KH booster Water Type Freshwater Sizes 4 oz, 16 oz Origin Made in USA Recommended Pairings Lower pH with Fritz pH Lower Stabilize at neutral with Fritz pH Neutralizer Browse all water care Frequently Asked QuestionsDoes it raise hardness too?Yes, it also increases KH (carbonate hardness).Which fish like higher pH?Hard-water species such as African cichlids and many livebearers.Any cautions?Above pH 6.0 ammonia becomes more toxic, so keep ammonia in check as you raise pH.