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Modern septic tanks have two lids: one that covers the inlet where wastewater flows into the tank and one that covers the outlet where the treated water flows out to the drain field. However, older septic tanks installed before 1975 may have only one lid. Because septic tanks last 20 to 40 years, if yours only has one lid, it may be time for a replacement.

Septic systems typically require servicing every 3-5 years, but frequency varies according to household size and tank capacity.

Your septic tank naturally contains the good bacteria it needs, so you typically don't have to add more as the system produces them on its own. However, if you wish to replenish the bacteria, you can use natural methods. For example, you can add three rotten tomatoes to your garbage disposal or flush 1/4 ounce of active yeast down the toilet every three months. While store-bought septic enzymes and chemicals are available, many additives are unnecessary and may even harm your system. The most effective way to maintain a healthy bacterial balance is to avoid using chemical drain cleaners, which can kill the beneficial bacteria in your tank.

Yes—septic tank systems are superior to cesspools in every conceivable way. If you’re not able to connect your home to a greater sewage network, a septic tank system and a drain field are great for responsibly disposing of waste. It’s also cheaper to pump a septic tank, easier to find a local septic tank professional than those who work with cesspools, and better for the environment.