1. (a) There are three (3) types of filters or screens used for wastewater applications:

   1. (1) Spin or screen filter;
   2. (2) Disk; and
   3. (3) Sand.
2. (b) Solids and other debris shall be filtered to a size of one hundred (100) microns or less.

3. (c)

   1. (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. (2) The clear Schedule 40 PVC piping allows for a direct observation of the wastewater as it flows from the:

      1. (A) Filter flush line; or
      2. (B) Field flush line.

Codification Notes: "PVC" means polyvinyl chloride.