Pumping equipment shall have sufficient capacity to discharge the volume of water for the required turn-over of the pool against the maximum head in the recirculation system. The pump used for backwashing sand filters shall have sufficient capacity to backwash the unit at the rate of at least 12 gallons per minute per square foot of filter area against the maximum head developed during backwashing.
12 Va. Admin. Code § 5-460-190
Statutory Authority
§ 35.1-13 of the Code of Virginia.