Spa or spray pool reservoir volume in gallons/3/average number of users per day = Number of days between draining, cleaning and refilling.
Wash. Admin. Code § 246-260-131
Statutory Authority: RCW 70.90.120. 05-09-004, § 246-260-131, filed 4/7/05, effective 5/8/05. Statutory Authority: Chapters 70.90 and 43.20 RCW. 04-18-096, § 246-260-131, filed 9/1/04, effective 10/31/04.