Water soluble pouches provide the perfect delivery system for this natural mosquito larvacide.Upon dissolving floating granules release the bti active ingredient across the surface of standing water.Will not harm fish amphibians or other beneficial aquatic organisms.One pouch treats up to 50 square feet.Works even in stagnant polluted or algae prevalent water.Repeat application every 7 to 14 days.Bacillus Thuringiensis Subsp. Israelensis (Bti); 1.7%.Dimensions (L x W x H):5.75 x 5.75 x 5.25