OAR 340-073-0041
Distribution Boxes, Drop Boxes, and Diversion Valves: Filter Fabric

Except as otherwise allowed by the department, filter fabric used as a barrier between the lower lens of drain media and the medium sand in a conventional sand filter system must meet the following specifications:

(1)

Material synthetic fabric, either spunbonded or woven.

(2)

Burst strength not less than 25 psi.

(3)

Air permeability not less than 500 cfm per sq. ft.

(4)

Water flow rate not less than 500 gpm per sq. ft. at 3 inches of head.

(5)

Hydrophilic surface reaction to water.

(6)

Equivalent opening size of 70 to 100 sieve.

(7)

Chemical properties:

(a)

Nonbiodegradable.

(b)

Resistant to acids and alkalis within a pH range of 4 to 10.

(c)

Resistant to common solvents.

Source: Rule 340-073-0041 — Distribution Boxes, Drop Boxes, and Diversion Valves: Filter Fabric, https://secure.­sos.­state.­or.­us/oard/view.­action?ruleNumber=340-073-0041.

340‑073‑0025
Tank Construction 340‑073‑0026
Septic Tanks 340‑073‑0030
Dosing Septic Tank 340‑073‑0035
Distribution Boxes, Drop Boxes, and Diversion Valves: Distribution Boxes 340‑073‑0040
Distribution Boxes, Drop Boxes, and Diversion Valves: Drop Boxes 340‑073‑0041
Distribution Boxes, Drop Boxes, and Diversion Valves: Filter Fabric 340‑073‑0045
Distribution Boxes, Drop Boxes, and Diversion Valves: Diversion Valves 340‑073‑0050
Distribution Boxes, Drop Boxes, and Diversion Valves: Dosing Tanks 340‑073‑0055
Distribution Boxes, Drop Boxes, and Diversion Valves: Dosing Assemblies: Effluent Pumps, Controls and Alarms, and Dosing Siphons 340‑073‑0056
Distribution Boxes, Drop Boxes, and Diversion Valves: Effluent Filters 340‑073‑0060
Distribution Boxes, Drop Boxes, and Diversion Valves: Pipe Materials and Construction 340‑073‑0065
Non-water-Carried Waste Disposal Facilities, Materials, and Construction: Privies and Portable Toilet Shelters 340‑073‑0070
Non-water-Carried Waste Disposal Facilities, Materials, and Construction: Unsealed Earth Pits for Privies 340‑073‑0075
Non-water-Carried Waste Disposal Facilities, Materials, and Construction: Self-Contained Nonwater-Carried Toilet Facilities 340‑073‑0080
Non-water-Carried Waste Disposal Facilities, Materials, and Construction: Construction of Gray Water Waste Disposal Sumps 340‑073‑0085
Non-water-Carried Waste Disposal Facilities, Materials, and Construction: Flexible Membrane Liners for Sand Filters Treating Septic Tank Effluent
Last Updated

Jun. 8, 2021

Rule 340-073-0041’s source at or​.us