page 7- New Swimming Pool
(4- Con't, Water Circulation in Pools,
ails in use, In the downward system the inlets are
placed in the walls of the shallower parts of the
pool and the outlets at the deepest points, In the
overflow system, the water is admitted near or
thru the pool bottom, and overflows the gutter rim
to return to the pumps thru the gutter drains,
One bottom recirculating patie’ de @ minimum for
‘reetanguler pools of ordinary lengths, not over 20
feet wide, For wider pools, two or more outlets should
be used, spaced not yeas ft. Where the distance
across the shallow portion of the pool is nie than
20 feet multiple inlets must be provided, se spaced
that each inlet will serve a linear distance of not
more than 20 feet,

IX, Recirculating Equipment,
1, The piping system of a recirculating pool must be

80 installed that each of the following operations
can be conveniently carried out,

(1- Fill pool from water supply

(2-Recirculate the water thru pool, filters,
sterilizers, etc,

(3-Backwash each filter separately

(4-Filter to waste (sewer)

(5-Operate pool suction cleaner

(6-Empty pool

(7-Drain entire system

It is desirable to paint all pipe lines in dis-
tinguishing color, preferably in accordance with

the American Society of Mechanical Engineers standards