page 8= New Swimming Pool |

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Con't Recirculating Equipment
and all valves must be plainly and explicitly labeled with
pdvaseeatte legible labels, It is desirable to frame manu-
facturer's directions for operating qquipment under glass and
mount them permanently, near the respective pieces of
apparatus,

Pumps

In most cases, @ single stage centrifugal pump designed

for large delivery against low heads, directly connected to

an electric motor, is found suitable,

3, Hair catchers

4.

A hair catcher, to keep out heir, fibers from suits and
other small solids, is necessary to protect the pump.
Filters

Pressure filters consist of a closed cylindrical steel
shell or tank, either vertical or horizontal, containing

a bed of screened sharp filter sand and crushed quartz and
filter gravel or anthracite coal at least 36" deep, under-
laid by a branching system of strainer pipes, The water
enters above the send bed, is forced down through its
successive layers, and leaves thru the pipes at the bottom,
The filter we have now is similar to this description,
Suction Cleaning System

The walls and floors of pool are cleaned while the pool is
filled with a suction system analogous to the household
vacuum cleaner, Suction piping is extended from the main
suction line i mediately in front of the hair catcher or
from a special pump to special inlets placed around the

pool, about 12" below the water surface, It may be the