Fiap premiumcare algoxan is the original longterm proven and efficient product for algae control the quick release of active oxygen destroys the cell membranes of thread algae through oxidation the algae die and dissolve remaining thread algae floating on the water surface can be removed or filtered out granules for spreading on areas covered in algae free from heavy metals and organic biozide colorless and residue free degradable applicable from a water temperature of 10c