Human: I have a septic system at my house. How can I keep it working properly? Assistant: 
To keep your septic tank working properly, you should regularly clean and maintain it. This includes cleaning out the tank every few years to remove debris and replacing the filter once a year. You may also need to add some chemical additives such as chlorine or phosphoric acid if your water is particularly hard or contains high levels of iron. Finally, make sure that you don’t overload the septic tank with too much waste.