<human>: I have a septic tank. How do I keep it from backing up?
<bot>: The best way to prevent a septic tank from backing up is to ensure that the tank is regularly pumped out and cleaned. You should also check for any potential blockages in the pipes leading into or out of the tank, as these can cause an overflow. Finally, you may need to add extra gravel or other materials to help the waste break down more quickly and avoid clogging.