Diatomaceous Earth (DE) Calculator: Pool Size & Amount

The amount of diatomaceous earth (DE) needed for a pool depends on several factors, including pool size, filter type, and water conditions. As a general guideline, you may need approximately 1.5 to 2 pounds of DE per 100 square feet of pool surface area.

For a pool measuring 35 feet long, 16 feet wide, and 7 feet deep, the surface area is calculated as follows:

Surface area = (Length x Width) + 2(Length + Width)

= (35 x 16) + 2(35 + 16)

= 560 + 102 = 662 square feet.

Using the ratio of 1.5 to 2 pounds of DE per 100 square feet, the estimated amount of DE needed for your pool is:

DE amount = (Surface area / 100) * DE dosage

= (662 / 100) * 1.5 to 2 pounds

= 9.93 to 13.24 pounds.

Therefore, you may need approximately 9.93 to 13.24 pounds of diatomaceous earth for a 35x16x7 foot pool. It's important to follow the specific recommendations and dosage instructions provided by the DE manufacturer to ensure proper filtration and water clarity.