HTH™ Pool Care Algae Guard+ Ultra is our most powerful pool algaecide, engineered to eliminate and prevent even the toughest algae.

• This non-staining, non-foaming algaecide for pools works fast to kill stubborn green, mustard, and black algae while preventing regrowth for long-lasting clarity and confidence. 
• Add it directly to your pool water! 
• No waiting, no complications, and enjoy a clean, clear, swim-ready pool in minutes. 
• Safe for all pool types, including vinyl-lined and saltwater systems, this professional-grade swimming pool algae cleaner gives you certainty all season long.

HTH™ is Here to Help!