34 Pa. Code § 41.72 – Maintenance of chemical closets.

(a) The containers shall be charged with a chemical solution of proper strength.
(b) At least once a day the contents of the container shall be thoroughly agitated with devices provided for that purpose.
(c) When the container is more than 2/3 full, the contents shall be removed and disposed of as night soil, in strict accordance with the law and the regulations of the Department of Environmental Protection.
(d) The stacks connecting the seat with the container shall be thoroughly cleansed at least every 2 weeks, or more frequently if necessary, to maintain them in a sanitary condition.

This section cited in 34 Pa. Code § 41.126 (relating to chemical closets).