HTH 67244 Swimming Pool Care Algae Guard Ultra - Long Lasting Formula, Eliminates & Prevents Green, Black, and Mustard Algae, Fast Acting & Effective Swimming Pool Chemical, 32ozBrand: HTH Features: BENEFIT: Get long lasting protection from extreme algae; This non foaming algae control kills and prevents blooms of all algae types OUR STRONGEST ALGAE CONTROL: Kills, prevents and protects against regrowth of heavy green, black and mustard swimming pool algae for up to 3 months NON FOAMING, FAST ACTING: Add HTH Algae Guard Ultra directly to your swimming pool water and swim right away COMPATIBLE WITH ALL POOLS: This non staining