§ 34-577. Filters.

(a)

Design. Filters shall be sized to accommodate or exceed the design flow rate of the system and provide water clarity.

(1)

Filters shall meet the standards of or be listed in the most recent edition of ANSI/NSF 50, "Circulation System Components and Related Materials for Swimming Pools, Spas/Hot Tubs", or similar criteria approved by the board of health.

(2)

Filters shall be designed so that filtration surfaces can be inspected and serviced.

(3)

The maximum flow rate of filters shall not exceed the requirements of the most recent edition of ANSI/NSF 50, "Circulation System Components and Related Materials for Swimming Pools, Spas/Hot Tubs", or similar criteria approved by the board of health.

(b)

Internal pressure. On pressure-type filters, a means shall be provided to permit the release of internal pressure.

(1)

Any filter incorporating an automatic internal air release as its principal means of air release shall have a lid(s) that provide(s) a slow and safe release of pressure as a part of this design and shall have a manual air release(s) in addition to automatic release(s).

(2)

A separation tank used in conjunction with a filter tank shall have a manual method of air release or a lid that provides a slow and safe release as it is opened.

(3)

The following statement shall be conspicuously visible within the area of the air release: "Do not start the system after maintenance without first opening the air release and properly reassembling the filter and separation tank and opening the air release valve."

(c)

Filter piping. Piping furnished with the filter shall be of suitable material capable of withstanding 1½ times the working pressure. The suction piping should be of such construction that it will not collapse when there is a complete shut-off of flow on the suction side of the pump.

(Ord. No. 09-0120, 1-7-09; Ord. No. 18-0340, Att. A, 5-16-18)