Swim World Algaecide 30 is non-metallic and non-foaming. Used for preventing and eliminating mustard, black and other algae species. Algaecide 30 is great for a maintenance dose to prevent algae from appearing. This can be poured straight into the pool. Use 4.3 to 8.6 fluid oz per 10,000 gallons of water each week. 32 fl oz bottle.