All check valves, low pressure drains and vacuum relief valves shall be maintained free of corrosion or other build-up and operative at all times during operation of the system.
Ga. Comp. R. & Regs. R. 40-23-2-.02
Ga. L. 1981, p. 1256; Ga. L. 1982, H.B. 1780 (O.C.G.A., Sec. 2-1-4).