105 CMR 435.32
Water Quality Maintenance
(1) Clarity and cleanliness of the water in a swimming, wading or special purpose pool shall be
maintained by a continuous recirculationofthe water through an appropriate filtration system approved
by the Board of Health. The following minimum turnover rates shall be maintained:
(a) swimming pools-once every eight hours,
(b) wading pools-once every four hours,
(c) special purpose pools-once every ½ hour.
(2) The operator of a special purpose pool shall cause the pool to be drained, cleaned, and refilled
a minimum of once every 14 days.