Md. Code Regs. 10.17.01.26

Current through Register Vol. 51, No. 22, November 1, 2024

Section 10.17.01.26 - Circulation System Components

A. Except as provided in §B of this regulation, an owner of a recreational pool, semipublic pool, or public spa shall ensure that circulation system components, including skimmers, pumps, filters, multiport valves, adjustable output rate chemical feeders, flow-through chemical feeders, chemical process equipment, chlorine generators, ion generators, and other pool and spa equipment comply with Circulation System Components and Related Materials for Pools, Spas/Hot Tubs.

B. The Secretary shall accept swimming pool, spa, or hot tub circulation system components as meeting the requirements set forth in §A of this regulation if these items are in the current published NSF listing of swimming pool, spa, or hot tub circulation system components or a listing from organizations accredited by the American National Standards Institute (ANSI) for the certification of circulation system components.

C. Chemical Feeder and Process Equipment. An owner of a recreational pool, semipublic pool, or public spa shall ensure that the capacity of chemical feeder and process equipment is adequate to:

(1) Provide the minimum required disinfectant residual to the pool or spa water, as required in Regulation .44A of this chapter; and

(2) Establish breakpoint when the combined chlorine level is over 0.2 ppm.

D. Chlorine Gas Feeders. An owner of a recreational pool, semipublic pool, or public spa shall ensure that the:

(1) Equipment installation, and operation of a chlorine gas feeder are in compliance with the American National Standard for Public Swimming Pools, with the exception that the word "shall" is substituted for the word "should", and the owner is required to comply with the specifications of Appendix E; and

(2) Recirculated water is treated downstream of the chlorine gas injection point to maintain the water's pH between 7.2 and 7.8.

E. Vacuum Systems.

(1) An owner shall ensure that a recreational pool, semipublic pool, or public spa has a vacuum system for cleaning the pool or spa floor.

(2) An owner of a recreational pool, semipublic pool, or public spa may use skimmer outlet pipes for vacuum purposes for circulation systems with four or fewer skimmers.

(3) For circulation systems with more than four skimmers or a gutter system, an owner of a recreational pool, semipublic pool, or public spa shall ensure that a vacuum system is provided that is separate from the skimmer or gutter system.

(4) If vacuum fittings are provided within a recreational pool, semipublic pool, or public spa, the owner shall ensure that the fittings are:

(a) Located at convenient locations approximately 1 foot below the water surface; and

(b) Provided with flush removable caps.

(5) When the vacuum system is an integral part of the circulation system, an owner of a recreational pool, semipublic pool, or public spa shall ensure that the vacuum line connection is before the pump hair and lint strainer.

F. Carbon Dioxide Feeders. An owner of a recreational pool, semipublic pool, or public spa shall ensure that a carbon dioxide feeder system is:

(1) Installed and maintained in accordance with the manufacturer's specifications;

(2) Located in a ventilated area; and

(3) Secured to prevent damage to the gas cylinder if the cylinder is subject to tipping.

G. Ozone Systems. An owner of a recreational pool, semipublic pool, or public spa shall ensure that:

(1) An ultraviolet light ozone system is used and installed according to Circulation System Components and Related Materials for Pools, Spas/Hot Tubs;

(2) A corona discharge ozone system is used and installed according to Circulation System Components and Related Materials for Pools, Spas/Hot Tubs, and the following requirements:

(a) The system is designed to provide a minimum concentration of ozone generated to be 1.5 percent by weight;

(b) The ozone gas is diffused through a static mixer into a contact column with a sidestream flow of recirculated water equal to a minimum of 5 percent of the required turnover rate;

(c) The system is designed to provide a contact time of:

(i) 2 minutes when used in conjunction with a chlorine disinfectant; or

(ii) 1 minute when used in conjunction with a bromine disinfectant;

(d) The system provides a minimum contact time value of 0.5 milligram/liter in the contact column when the contact time value equals the concentration of dissolved ozone in milligrams/liter times the contact time in minutes;

(e) The air feed, which is natural or oxygen enriched air, is filtered to remove particulates and dehumidified to a minimum dew point of minus 60°C before the ozone generating chamber;

(f) An ozone gas feed line is ozone resistant;

(g) Valves are provided to control flow through the system;

(h) Offgas venting from the contact column is:

(i) Equipped with an ozone destruct system that removes all ozone before release to the atmosphere; or

(ii) Returned to the main recirculation line when used in conjunction with a bromine disinfectant;

(i) When necessary, a foam suppression system is provided before offgas venting;

(j) The oxidation reduction potential of the sidestream after contact and before dissolved ozone removal is a minimum of 650 millivolts;

(k) The dissolved ozone is removed from the sidestream using granulated activated carbon before remixing with the recirculated water when used in conjunction with a chlorine disinfectant;

(l) The ozone generating system shuts off if the water recirculating system shuts off or if the vacuum is lost on the ozone gas output line;

(m) The ozone gas output is under negative pressure or a vacuum;

(n) The ozone generation area is ventilated at 2 cfm per square foot of floor area to prevent the build up of excess ozone; and

(o) The recirculated water is treated to maintain the pH between 7.2 and 7.8.

H. An owner of a recreational pool, semipublic pool, or public spa may connect an equalization line for a skimmer to the main drain line in a wading pool, or other pool that does not have sufficient water depth, for the installation of the equalizer line through the pool wall below the skimmer throat.

Md. Code Regs. 10.17.01.26

Regulation .26 amended effective December 19, 2005 (32:25 Md. R. 1942)