(1)Filters shall be capable of maintaining pool water clarity as described in Pool Water Quality, OAR 333-060-0200 (Pool Water Quality) and Table 3 under conditions of maximum user load. [Table not included. See ED. Note.]
(2)Filter rate shall not exceed the following:
(a)High rate sand filters — 18 gpm per square foot of filter media or that rate approved by the manufacturer for that particular filter, whichever is less. Pools constructed prior to May 1, 1986, may continue to use filters sized at 20 gpm per square foot of filter media until replaced;
(b)Rapid sand filters — 3 gpm per square foot of filter media;
(c)Diatomaceous earth filters — 2 gpm per square foot of filter media;
(d)Cartridge filters — 0.375 gpm per square foot of effective filter area.
(3)A means shall be provided to permit release of air which enters the filter tank.
(4)Filter components which requires servicing shall be accessible and available for inspection and repair.
(5)Filters shall be designed so that filtration surfaces can be easily inspected and serviced.
(6)Filters shall meet the safety performance standards of the National Sanitation Foundation Standard Number #50 depending on the filter media.
(7)Separation tanks or settling sump are required with DE filters. Separation tanks shall:
(a)Be provided with a manual means of air release or a lid which provides a slow and safe release of pressures;
(b)Have a precautionary statement affixed warning the user that the air release must be opened before starting the circulation pump.
Rule 333-060-0140 — Filters,