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| This is BioGuard®'s most effective algae preventative.
Highly effective formula prevents wide variety of algae growth
Stable in sunlight and will not evaporate
Activity increases as water temperature rises (and you need protection the most)
Powerful surfactant/wetting agent makes Back Up able to work in tiny cracks and crevices where algae starts
Will not affect pH levels
Non-staining
Applying Back Up is STEP 3 of the BioGuard Once-a-Week 3-Step Program and the BioGuard 3-Step Program.
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