The parts
- Septic tank — settles solids
- Treatment unit — a blower adds air so bacteria can break down waste, or effluent passes through filter media
- Clarifier or pump tank — settles remaining solids and doses the field
- Disposal field — the soil finishes the job
- Control panel and alarm — runs the pump and warns of problems
Why it works better near groundwater
Effluent leaving an advanced unit is much cleaner than effluent from a tank alone, so less soil is needed to finish treatment.
Upkeep
- Keep the power on
- Don't ignore the alarm
- Schedule service as required
- Pump the tank periodically
- Avoid harsh chemicals that kill the bacteria
Common questions
What does the alarm mean?
Usually a high water level or a stopped blower or pump. Use less water and call for service.
Can I turn it off to save power?
No — the bacteria need air to work.
How long do units last?
Many years with service; parts like blowers are replaced periodically.