010-4 Wyo. Code R. §§ 4-10 - Filters; Types, Uses, Requirements

(i) Filters used in pools, spas and similar installations shall be capable of maintaining pool water clarity as described in chapter 5, section 1(a) under maximum use load conditions.

(ii) The filter rate shall not exceed the following:

(i) High rate sand filters - twenty (20) gpm or (56.8 lpm) per square foot (.093cm²) of filter media or that rate approved by the National Sanitation Foundation for that particular filter, whichever is less;

(ii) Rapid sand filters - three (3) gpm (11.4 1pm) per square foot (.093m2) of filter media;

(iii) Diatomaceous earth filters - two (2) gpm (7.6 1pm) per square foot (.093m2) of filter media; or

(iv) Cartridge filters - 0.5 gpm (1.9 1pm) per square foot (.093m2) of effective filter area.

(c) The filter tank shall be designed to permit the release of air that enters the filter tank.

(d) Filter components that require servicing shall be accessible and available for inspection and repair.

(e) Filters shall be designed so that filtration surfaces may be easily inspected and serviced.

(f) Filters shall meet the safety performance standards of the NSF-50, Circulation System Components and Related Materials for Swimming Pools, Spas/Hot Tubs.

(g) Diatomaceous earth filter backwash water must discharge to the sewer system through a separation tank.

(i) The separation tanks shall:

(A) Be provided with a manual means air release mechanism or a lid that provides a slow and safe release of pressure; and

(B) Have a precautionary statement affixed to warn the user that the air release must be opened before starting the circulation pump.

(h) Pools with a perimeter overflow system shall be provided with surge tanks unless predesigned and prefabricated to use in-gutter surge.

(i) The surge tanks shall have a capacity of one (1) gallon (3.8 l) per square foot (.093m²) of pool surface.

Notes

010-4 Wyo. Code R. §§ 4-10