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
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