SAND FILTER MAINTENANCE
Sand filters are holding tanks that collect and filter stormwater flowing off impervious surfaces before the water flows into the stormwater network. They hold the water back and remove harmful contaminants.
They are usually installed where stormwater runoff contains high levels of:
- brake lining,
- rotting vegetation and
The profile of a sand filter is usually:
- Sand or sand-peat – 400mm;
- Geotextile cloth;
- Perforated 100mm undertrains with 10mm holes at 100mm intervals;
- 24/7 scoria surrounding the underdrains – 150mm.
These devices act as a filter to stop silt, litter and all other pollutants entering directly into the stormwater system. Like any filter, the media blocks up over time and needs cleaning to prevent it from becoming impervious and causing flooding or untreated stormwater entering the stormwater network.
Typical sand filters require maintenance every six months, but heavily trafficked areas may require more frequent cleaning.
The frequency of maintenance services will be reviewed by Dutton Stormwater at the completion of each service and this recommendation will be included in the service report.
- Complete all the required health and safety documentation including confined space entry permits
- Vacuum out all silt and sludge from the sedimentation chamber
- Scrape the top layer of silt and debris from the top of the good sand and vacuum it up
- Aerate and rake the remaining good media level
- Carry out water blasting
- Check inlet and outlet pipes
- Check for leakages and odours
- Check for any structural deterioration
- Replace the media removed to maintain a level of 400mm
- Dispose of waste media off site at an approved environmental disposal facility
- Complete a service report for your records