(a) Licensed Engineer. The circulation system of a lagoon constructed on or after the effective date of this subchapter shall be designed by a licensed engineer.
(b) Circulation. The circulation system shall provide complete and uniform circulation of the water necessary to maintain the water quality requirements in this subchapter, unless an alternate method of disinfectant has been approved by the department.
(c) Access for inspection or repair. Circulation system components shall be accessible for inspection, servicing, repair, or replacement and shall be installed in accordance with manufacturer's specifications.
(d) Non-toxic materials. The circulation system piping and fittings shall be non-toxic, and shall be of materials able to withstand operating pressures and conditions. Polyvinyl chloride pipe shall bear the NSF seal for potable water and be schedule 40 or stronger.
(e) Operation and maintenance instructions. Circulation system operation and maintenance instructions shall be provided to the operator of the lagoon. A copy of the instructions shall be kept in the building housing the circulation system.
(f) Gauges and meters. For a lagoon constructed on or after the effective date of this subchapter, the circulation system shall be equipped with:
  (1) a filter inlet pressure gauge on each filter;
  (2) a filter outlet gauge on each filter; and
  (3) a flow meter installed according to manufacturer's instructions and located to show the rate of flow through each filter in gallons per minute and that is represented by the manufacturer to be accurate within 10% of the true flow rate.
(g) Labeling of exposed piping. Exposed piping shall be labeled to identify the piping function and direction of flow. The name of the liquid or gas and arrows indicating direction of flow shall be permanently indicated on the pipe in a legible manner through use of labeling, writing, or other means.

Source Note: The provisions of this §265.156 adopted to be effective March 1, 2020, 45 TexReg 1024