Different Algaecides will attack algaes in different ways. There are multiple types of algae and are commonly described by their colours: black, mustard, green or red.
We recommend attacking algae with a sanitiser (chlorine) initially and using an algaecide as a backup and a preventative. Generally if you are experiencing algae blooms, your sanitiser level must be low or there is poor filtration.
The most popular algaecide contains copper. Some cheap copper algaecides can cause the copper to fall out of solution and stain the pool surface, however our copper based algaecides have a sequestering agent which means this will not occur.