Section Env-Wq 1109.09 - Turn-over Rates(a) Any swimming pool installed on or after May 1, 2014 shall have a minimum circulation flow rate of one pool water turnover every 6 hours.(b) If any swimming pool installed prior to May 1, 2014 that, when operated in accordance with these rules cannot consistently maintain water quality, is substantially modified after the 2021 effective date of this chapter, the final minimum circulation flow rate shall be one pool water turnover every 6 hours.(c) For swimming pools installed prior to May 1, 2014 and not substantially modified thereafter, the following shall apply: (1) Any swimming pool with an average water depth of greater than 4 feet shall have a minimum circulation flow rate of one pool water turnover every 8 hours; and(2) Any swimming pool with an average water depth of 4 feet or less shall have a minimum circulation flow rate of one pool water turnover every 6 hours.(d) Turnover rates for water covering an underwater shelf shall be as specified in Env-Wq 1108.20(b)(5).N.H. Admin. Code § Env-Wq 1109.09
Derived from Volume XLI Number 19, Filed May 13, 2021, Proposed by #13198, Effective 5/1/2021, Expires 5/1/2031 (see Revision Note #3 at chapter heading for Env-Wq 1100) (formerly Env-Wq 1106.09)