Seems his name to make all the glory ...

Have it now since 3 weeks in there on my stone back wall brush algae will not go away.
Have of course also for the causes of algae searched. Imbalance in the fertilization ... what else.

Anyway, you can not complain that the product seems to keep its promises. However, it had only really when I recommended dose / week exceeded gesammt to 10ml. So careful ranpierschen. Each basin reacts different.

In my other pools such as: helped Gesrstenstrohpellets ... see Youtube "barley straw pellets"
As I said every pool is different.