Tetra Water Clarifier 3.38 fluid Ounces, This phosphate-free liquid solution is safe to use in all freshwater aquariums. These larger particles are then removed during normal power filter operation. This formula is based on clarifiers used to treat drinking water. it's safe to use with fish and plants and will not affect water pH levels in your aquarium. Unlike many clarication products on the market, Tetra WaterClarifer is safe for fish even in very soft water (low KH) conditions. However, in extremely...