Why does my septic tank have 2 lids?

What are the 3 types of septic systems?

- Septic Tank. - Conventional System. - Chamber System. - Drip Distribution System. - Aerobic Treatment Unit. - Mound Systems. - Recirculating Sand Filter System. - Evapotranspiration System.

Why does my septic tank have 2 lids?

https://www.youtube.com/watch?v=avw6OBz_KWQ

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