HTH Ultimate Algae Guard is the strongest algaecide formula available from the brand pool owners have trusted for over 25-years. Ultimate Algae Guard both kills and prevents even the most stubborn green， black and mustard algae. This non-foaming algae guard treats pool water for up to 90-days after applying to your pool – and you can swim just 15-minutes after use.
Kills and prevents all algae types including green， black and mustard algae
Our strongest， fast-acting formula
Non-foaming algaecide for your swimming pool
Lasts longer – treats pool water up to 90-days
Swim 15-minutes after applying algaecide to your pool
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