(A) Pools shall be of the recirculating type. Provisions shall be made for complete, constant, continuous circulation of water through all parts of the pool. The circulation system shall not be turned off except for necessary maintenance or when the pool is taken out of service for an extended period of time. A recirculation system consisting of piping, pumps, filters, water conditioning and disinfectant equipment and other accessory equipment which will clarify and disinfect the volume of water in the pool shall be provided for all swimming pools. Pools shall be provided with a rate flow meter or meters installed in accordance with manufacturers directions to measure all necessary rates of flow as indicated by this article. A lint and hair catcher shall be provided on all circulation pump suction lines. All swimming pool water shall be recirculated through rapid sand, high rate sand, cartridge-type or diatomite filters. The rate of flow through the filter shall not exceed the National Sanitation Foundation approved rate. All filters shall bear the Seal of Approval of the National Sanitation Foundation.
(B) (1) Pump and motor units for recirculation shall be selected for performance and will meet the conditions of quantity required for filtering and cleaning the filters with the total dynamic head developed by the complete system. The requirements for filtration shall be based upon the maximum head loss developed immediately prior to washing the filters. Pump performance curves for the unit to be installed shall be submitted with the construction plans for approval.
(2) The filtration system shall be designed to be operated at a rate sufficient to assure a complete recirculation of the pool water through the filter and automatic disinfection system within the following maximum time periods:
(a) For Class A and Class B pools, six hours;
(b) For Class C pools, two hours;
(c) For Class D pools, one hour
(3) Any filtration system lawfully installed prior to the effective date of this article which does not consistently meet the maximum time period may continue in use only if the filtration system complies with all standards of disinfection and water clarity established elsewhere in this article. A system which is not consistently in compliance must be upgraded to meet the recirculation requirements of this division (B) by the deadline established in writing by the Enforcement Authority.
(C) Filters shall be piped for effective backwashing, excluding disposable cartridge-type filters. If rapid sand filters are used, a minimum of three filters shall be provided. The backwash rate shall meet National Sanitation Foundation approved backwash rate. Disposable cartridge filters shall be kept clean.
(D) Provisions shall be made for disposing of backwash water and pool contents to the city sanitary sewer. A two chamber sand interceptor served by a sewer line meeting the requirements set forth in the Uniform Plumbing Code (UPC) shall be provided for all backwash systems installed on a pool after the effective date of this article.
(E) Diatomaceous earth filtered water must be discharged into a sewer in a manner which eliminates solids from the discharge. This shall be done by using a separation tank, receiving chamber, or any other permanent method approved by the Enforcement Authority.
(F) Nonpermanent media filters shall also have suitable provision for adding feed chemicals or filter media.
('74 Code, § 11-5-7A.9) (Ord. 12-1978; Am. Ord. 59-1987; Am. Ord. 51-1989; Am. Ord. 12-1993)