Dealing with problems

Find out about:

• signs of trouble
• solving problems
• avoiding problems.

Signs of trouble

The system is not working correctly if:

• there is a foul smell around tank or land application area
• the tank overflows
• the ground around the tank is soggy
• sinks/basins/toilets are emptying slowly
• fixtures make a gurgling noise when emptying
• the grass is unusually dark green over the land application area
• black liquid is oozing from the trenches
• a gully trap or tank mushroom is overflowing.

Problem	Solution
Tank is too full.	Have it pumped out.
Tank contains too much sludge and scum.	Have it pumped out/desludged.
Too much water going into the tank.	Use less water and check for stormwater infiltration.
Toxic chemicals are going into the system.	Reduce use of hard detergents/cleaners.

Avoiding problems

• Specify water-efficient appliances.
• Prevent overloading the system by minimising water use (e.g. spread heavy water-use activities such as clothes washing over several days) and installing a separate greywater treatment system.
• Strong chemicals restrict the biological action within the tank – select cleaners and washing products that do not hamper the decomposition process, and make sure chemical products such as volatile thinners, bleaches and disinfectants do not enter the system
• Kitchen waste should not enter on-site wastewater treatment systems – compost kitchen waste instead of installing a garbage disposal unit.
• Systems cannot deal with condoms, dental floss, tampons, sanitary napkins, nappies and nappy wipes – these should be wrapped up and disposed of in the rubbish.