Pond Dye
Pond dyes, pond colorants or pond water sunblockers work by blocking the sun's rays that penetrate through the water. Pond dyes color the water a variety of shades of colors including blue pond dyes, turquoise pond dyes and blue/black pond dyes. Some pond dyes are EPA registered like Aquashade is while others aren't and can be less expensive. These dyes can also be used as lake dyes and fountain dyes (depending on what it's made out of).