SeaKlear 90-Day Algae Prevention & Remover 32 oz

Only requires application once every 3 months

Effective against blue-green, black, and mustard algae

Formulated to be non-staining

Excellent broad-spectrum algaecide with a long-term residual effect in the pool

Based on a low-dose organic copper complex 

Can also be used safely in spas, as well as pools