- Water may not move at more than 8 feet per second through
copper pipe.
- Water may not move at more than 10 feet per second through
PVC.
- Water may not move at more than 8 feet per second through
any type of suction pipe.
TURNOVER RATES
Pools must turn over in 6 hours
Spas must turn over in 1/2 hour
Wading pools must turn over in 1 hour.
FILTRATION STANDARDS
| FILTER STYLE |
MAXIMUM FLOW
(gpm / sq.ft.) |
MINIMUM BACKWASH
FLOW (gpm / sq.ft.) |
| High-rate sand |
15 |
15 |
| DE |
2 |
2 |
| Cartridge |
0.375* |
No backwash |
* Note that cartridge filters are rated at 1 gpm / square foot
maximum flow rate on most residential applications and the more
stringent 0.375 gpm / sq. ft. on commercial installations.
Rapid sand filters are designed for flow rates of less than
3 gpm
Hi-rate sand filters are designed for flow rates of 5 to 20
gpm
The normal filter operating pressure differential (between
incoming pipe and outgoing) is between 2 and 4 psi. When it reaches
10 psi, the filter must be cleaned. Expressed another way, if
you know the normal operating pressure of your filter (as observed
on the pressure gauge), you must clean the filter when the pressure
is more than 10 psi higher.
Water flow must not exceed 100 gpm through 1 1/2 inch heater
plumbing.
Water flow must not exceed 125 gpm through 2 inch heater plumbing.
Water flowing out of a heater should not be more than 10°F
warmer than the water flowing into the heater.
Pool water should not exceed 82°F.
Spa water should not exceed 104°F.
The on / off switch of a millivolt heater must not be located
more than 20 feet from the heater.
HEATER INSTALLATIONS
- The rear and non plumbed sides must have at least 6 inches
of clearance.
- The plumbed side must have at least 18 inches of clearance.
- the front must have at least 24 inches of clearance.
- The top must be at least 5 feet below (and 4 feet horizontal
distance) any window, door or vent.
- The top must be at least 3 feet below any overhang.
- PVC gas lines must be buried at least 18 inches below ground
( 12 inches below concrete ).
- Metal gas lines must be buried at least 12 inches below ground
(6 inches below concrete).
To accommodate a diving board, a pool must be at least 7 1/2
feet deep, 15 feet wide and 28 feet long.
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