4X Blue Pond Dye + Pond Cleaner, 2-in-1 Pond Dye Blue + Enzymes, Makes Murky Pond Blue, Clean & Beautiful, Blue Dye for Ponds & Lakes, Keeps The Water Cool, Clear & Ideal for Fish & Wildlife, 32 oz.

I’ve used many bluing agents for ponds, and this blue is the best I’ve ever used. When they say it’s concentrated, they’re not kidding! The deep dark blue dye quickly permeates my 1/4 acre pond and colors the water a deep blue hue. This helps control algae growth, or better said, retards algae growth noticeably. I have a 12 foot waterfall and I add the concentrated dye near the water intake to the pump. Within a couple of minutes the blue tint speeds over the waterfall and spreads evenly over my pond. It is heavily concentrated, giving you a grerat value for your money. The concentrate functions well, so start slow because you can always more. You won’t believe how well this dye works on your pond or water project!

Very good color and it’s working great. I would recommend.

I built a pond roughly 20' x 45' and 4 feet deep. I added about 2 to 3 ounces of product which made the pond extremely blue. Ended up draining the pond and refilling since the customer didn't like the color.

It really works good mad my big pond beautiful

It’s does what it states