OAR 333-062-0115
Filters
(1)
Filters shall be capable of maintaining pool water clarity as described in OAR 333-062-0165 (Spa Water Quality)(1)(i) under conditions of maximum user load.(2)
Public spa pool filter rates shall not exceed the following:(a)
High rate sand filter — 18 gpm per square foot (.093 m2) of filter media or that rate approved by the manufacturer for that particular filter, whichever is less;(b)
Diatomaceous earth filters — 1.5 gpm (5.7 1pm) per square foot (.09 m2) of filter media;(c)
Cartridge filters — 0.375 gpm per square foot of effective filter area. Effective filter area shall be that as determined by a testing laboratory recognized by the Division to make such tests.(3)
A means shall be provided to permit release of air which enters the filter tank.(4)
Filter components which require servicing shall be accessible and available for inspection and repair.(5)
Filters shall meet the safety performance standards of the National Sanitation Foundation Number 50 for Circulation System Components for Swimming Pools.(6)
Separation tanks or settling sumps 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.
Source:
Rule 333-062-0115 — Filters, https://secure.sos.state.or.us/oard/view.action?ruleNumber=333-062-0115.