It is Important to determine gallons in your swimming pool to use the proper amount of chemicals. The formulas below are used to measure gallons:

Length x width x average depth (measure depth at shallow end and depth at deep end, add them together and divide by 2…this is the average depth) x multiplier*.

*The Multiplier for rectangle, square and freeform pools = 7.7.

*The multiplier for round or oval pools is 5.9.

Example: 28 x 14 x 4 x 7.5 = 11,760 gallons for a 14 x 28′ pool, avg. depth 4′.

Example (8′ round spa) =Volume = area x depth (average) x 5.9.

3.14 x 4′ (radius…one half of 8′ diameter) x 4 (the number itself) = 50.24 x 3′ (average depth) x 5.9 = 2,668 gallons for an 8′ circular spa.

See Chart Below for Example for Standard Florida Pool Sizes:

Pool Size 3.5′ Avg. Depth 4′ Avg. Depth 4.5′ Avg. Depth 5′ Avg. Depth
12′ x 24′ 7,600 8,600 9,700 10,800
14′ x 28′ 10,300 11,800 13,200 14,700
15′ x 30′ 11,800 13,500 15,200 16,900
16′ x 30′ 13,400 15,400 17,300 19,200

Pool Chemistry Chart: (Ideal Readings)

Chlorine 3-5
PH 7.4-7.6
Alkaline 80-120
Calcium 250-400
CA 50-70
Salt 2500-3100
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