Seachem Clarity is a water clarifier for freshwater and marine aquariums, including reef and planted tank setups. Available in 250ml and 500ml sizes, it treats cloudiness from both chemical compounds and particulate matter — disturbed substrate, bacterial blooms, chemical reactions — using a single polymeric flocculating and precipitating agent.

When added to the aquarium, Clarity binds together the particles and chemicals causing cloudiness into larger aggregates, which the mechanical filtration system then removes. Unlike clarifiers that address only one cloudiness type, it works on both chemical and particulate causes in a single dose. The formula is safe for fish, invertebrates, live coral, and aquatic plants, and does not disrupt biological filtration.

Clarity suits aquarists who want a single product covering multiple cloudiness causes without risking sensitive reef or planted setups. Once the water clears, cleaning the mechanical filter removes the collected debris — after which the tank should return to full clarity.