Sand Filter Construction Specifications

							Sand Filter Construction
Specifications
Based on EPA Certificate of Approval N. 1.3/03 and
Section 7 of EPA Publication No. 500 – Code of Practice
for Small wastewater Treatment Plants




                                                               100mm
                                                             100mm




                                                                      Mortar Seal




                         Construction Specifications                                        Filter Sand Specifications
Liner                Canvacon required if water table is close to surface           Use clean washed sand complying with
Distribution box     Minimum internal width 250 mm                                  these requirements.
                                                                                    For sand filters loaded at less than
Distribution pipes   Slotted 90 mm plastic pipe                                     50L/sq metre/day sand:
                     (Complying with AS 2439)
                                                                                            Must contain less than 5% of
Inlet from Septic    100 mm Sewer Grade Plastic Pipe (Complying with AS                     clay and fine silt by volume
                     1260)                                                                  Must have an effective size
Collection Pipe      100 mm Sewer Grade Slotted Pipe                                        between 0.25 and 0.60mm
                     (Complying with AS 2439)                                               Must have a uniformity
                                                                                            coefficient less than 4
Pump chamber            Minimum internal diameter 750 mm
                        Base of Chamber 1000 mm below sand filter outlet
                        invert
Alarm Float          100 mm above cut in
Pressure Main        Minimum 40 mm diameter
Alarm                An alarm or light indicating a pump failure must be
                     fitted to the pump well or within the building being
                     services by the septic system
                                                                                                CONTINUED OVER PAGE


Environmental Health Services                                                                                    17/06/08
Golden Plains Shire Council
  5220 7140
CROSS SECTION OF SAND FILTER




TOP VIEW OF SAND FILTER




Environmental Health Services   17/06/08
Golden Plains Shire Council
  5220 7140