Polyquaternary Ammonium Chloride

To treat established algae: Shock the pool then dose 20 ml per 1 m3 of pool water.
To prevent algae re-appearing: Each week add 2-3 ml per 1 m3 of pool water.
To prevent algae before it is established: At the start of the season dose 20 ml per 1 m3 of pool water.