Law Supply, Inc.
Web Page - Water Requirements of Swimming Pools
 


 
Holding Capacity
(gallons)
A B C D E F G H
55500 8' 9' 5' 3' 3" 15" 20' 60' 20'
80800 8' 9' 5' 3' 3" 15" 20' 75' 25'
120000 8' 9' 6" 5' 3' 3" 15" 25'' 90' 30'
155600 8' 10' 5' 3' 3" 15" 25' 105' 25'
207600 8' 10' 5' 3' 3" 15" 30' 120' 40'
254000 8' 10' 5' 3' 3" 15" 30' 135' 45'
306000 8' 10' 5' 3' 3" 15" 30' 150' 50'
422400 8' 10' 5' 3' 3" 15" 30' 180' 60'
558000 8' 10' 5' 3' 3" 15" 30' 210' 70'

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Bathing Capacity per Day Assuming 24-Hour Operation on Basis of Refiltration

Holding
Capacity
(gallons)
8 Hours
400 Gallons
per Swimmer
10 Hours
625 Gallons
per Swimmer
12 Hours
900 Gallons
per Swimmer
16 Hours
1600 Gallons
per Swimmer
Swimmers Pump
Capacity
(gpm)
Swimmers Pump
Capacity
(gpm)
Swimmers Pump
Capacity
(gpm)
Swimmers Pump
Capacity
(gpm)
55500 418 116 214 93 124 72 53 58
80800 606 168 311 135 180 112 76 84
120000 900 250 461 200 267 167 113 125
155600 1170 324 597 260 346 216 146 162
207600 1555 432 796 346 461 288 195 216
254000 1905 530 975 423 565 353 238 264
306000 2300 638 1177 510 681 425 288 318
422400 3170 880 1623 705 950 586 397 440
558000 4180 1160 2145 930 1242 775 524 581

The period of refiltration of the pool takes into account the amount of water per bather per day, determined empirically.

The pump requirements depend up various factors comprising the head and upon the rate of refiltration and backwash of the filter. In this case, the head is comprised of total friction in the pipes leaving the pool and draining it into the filters, as well as of the back pressure at inlets, strainers, and the resistance to the filter beds. On the average, total head is usually figured between 40 and 60 feet, depending on the size of the pool in question.

In selecting the capacity of the pump, the local requirement of the minimum period of refiltration (if any) is used. In addition to the duty of recirculating, the pump must also be capable of supplying water for backwash. The flow through each filter when backwashing is four times the normal flow.

When the filter installation consists of three or more filters, and only one is backwashed at a time, then the pool circulating pump will have ample capacity for backwashing.

If a single filter is used, a separate backwash pump should be provided with a capacity approximately four times that of the circulating pump.



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Last updated 05/19/2003