HTH Super Algae Guard 60 1 Qt. Liquid Algae Control

4-in-1 formula kills and controls green, black, and yellow algae growth, is non-foaming, and 60% strength. Swim immediately. Active ingredients: Alkyl dimethyl benzyl ammonium chlorides 30%, alkyl dimethyl ethylbenzyl ammonium chlorides 30%, other ingredients 40%. Compatible with salt systems.