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At the very bottom of the pool are the bottom drains . By regulation , they must be 36" apart . Either of these drains must be able to support the total suction of the filtration system . Theis is the Virginia Grahme Baker regulation . At other places on the pool bottom you may see smaller discs . These are the returns , the outflow of the filtration system .
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Earn +20 ptsQ: What are 2 white disc shaped things at bottom of pool?
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