14 CAR § 20-106. Filters and screens

(a) There are three (3) types of filters or screens used for wastewater applications: (1) Spin or screen filter; (2) Disk; and (3) Sand. (b) Solids and other debris shall be filtered to a size of one hundred (100) microns or less. (c)(1) Filter debris shall be returned to the septic tank, pretreatment unit, or a separate settling tank regardless of the type of filter system. (2) The clear Schedule 40 PVC piping allows for a direct observation of the wastewater as it flows from the: (A) Filter flush line; or (B) Field flush line.