Tanks should be examined for accumulation of sludge at least every 2-3 years. If sludge is covering the bottom of the tank it should be removed.
Waterview Plumbing Sydney has a 6 point check:
- INSPECTION OF CATCHMENTS
- EMPTY AND CLEAN FIRST FLUSH DIVERTERS
- REPLACE OR CLEAN FILTRATION
- CHECK SEDLIMENT OR SLUDGE LEVEL IN TANK
- WATER QUALITY TESTING
- INSPECTION OF PUMP
Maintenance programs quarterly/annually/2-3 years.