Tannin Stains or Yellow Water and It’s Treatment

Tannin Stains or Yellow Water and It's Treatment

My pond is about 3 months old. The water is clear but has a yellowish tint that I would like to get rid of. I have koi and water plants in the pond. All my water tests are fine except the water seems to be ‘hard’ and the pH is about 8.5 in the afternoon. … Read more