4X Blue Pond Dye - Transforms Murky Water to Natural Blue - Super Concentrated Lake & Pond Dye - Liquid Shade Treats Up to 1 Acre - Safe for Fish & Wildlife (32 oz)

Works well in my 1 acre rainwater collection pond. Nice color lasts for months or until a heavy rain pushes the blue water over the overflow. I prefer the blue color to the natures brown/green. Adding color to several spots along the shoreline is all you do. Color automatically spreads throughout pond.

very good its work well

Added one bottle to our 3 acre lake and it was a beautiful blue color. Awesome product for the price

looks very nice, does reduce algal growth and not harm fish, said to last a year, mine lasted longer but turned greenish blue

Small pond owners beware start with just a cap this stuff is made for a giant pond like in a neighborhood

This stuff works really well!!

Wanted to slow the growth of Duck Weed and I think it helped but it will take more than the blueing of the water to rid the pond of it. I’ll order again to get the pond darker next summer. It does stain skin and clothes or anything that comes into contact with the spray or lid

I won't purchase this product again. The dye is not 4X concentrated as before.