Section 38(1) in The West Bengal Factories Rules, 1958
(1)The maximum number of daily users for whom the tank is designed shall be approved by the [Public Health Engineering Directorate] [Substituted by Notification No. 340 L.W. /L.W./IR-4185 dated 2nd April 1986], West Bengal, and a notice board showing such number shall be fixed in a prominent position on each latrine.Septic tanks constructed after commencement of this rule shall be so designed as to allow a space of [57 to 85 cubic centimeter] [Substituted by ibid.] per user. The ordinary filter beds shall have [170 cubic centimeter] [Substituted by ibid.] of filtering media per every user and for rotary filters the capacity may reduced to 0.085 centimeter per user.
