is water clearing product safe

[Kepouros]

Koi Carp, Mirror Carp, Common Carp, Ghost Koi. Grass Carp, Orfe and Tench are the reason I clear the water.  The fact that I try to keep it as natural as possible is no reason why I shouldn`t wish  to see the fish

[Kepouros]

[Ishard]

I too have koi, japanese koi, but I wouldnt use that product. I have made sure my filters and UV are the best I can get but each to his/her own. ;D