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
For maximum care to encourage a healthier pond, use the PureBlue Pond Sunblock 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.