One gallon will dye a one-acre pond 4 ft. deep depending on flow through, etc. for 5-6 weeks. It is a very natural blue, and not a light tropical tint.
Pure Blue Pond Dye is easy to use. After consulting the label and then calculating how much to use, simply shake well and pour the dye along the shoreline in several places. Natural water movement will disperse the dye in 12-24 hours. Be sure to rinse out any residual dye in the bottle. Use gloves when applying the concentrate dye, as it will stain. Once dispersed the dye will not stain.
Use the help below to figure out how much you'll need to order for a good result.
Water Volume of a Square or Rectangular Pond
Length X Width X Avg. Depth X 7.5 = Gallons
Water Volume of a Round Pond
(r is the radius- the radius is the distance from the center to the edge)
r x r = X, Multiply the X above by 3.14 = A
Multiply A by the average depth of the pond, then by 7.5 = Gallons
(One acre foot = 325,851 Gallons)
For maximum care to encourage a beautiful, clear pond, use the PureBlue Pond Dye with PureBacteria+ Muck Reducer.
Also remember that a healthy pond has adequate oxygen, so aeration is key, especially if you have fish in your pond.