This is BioGuard®'s most effective algae preventative.
Highly effective formula prevents wide variety of algae growth
Concentrated formula needs application only every two weeks
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
Won't affect pH levels
Non-staining applying Back Up is STEP 3 of the BioGuard Once-a-Week 3-Step Program
Our Resident Pool Chemistry Expert's Thoughts:
One of our most important products. Back Up makes water wetter! Funny, huh?! Well it does. You can't see them, but there are tiny air pockets in the water. Water bugs swim through these airways to get the oxygen. When you add Back Up to the water, the pockets close and it drowns those pesty bugs! Not to mention that it's a broad spectrum algae preventive. All you need is 1 qt. per 25,000 to start the season and 2 oz. per 5,000 gals. every other week. (It's easier for me to remember if I cut that amount in half and put it in weekly.) Also a really good idea to add the weekly amount if you get heavy rains.
