My house has a MoDad system and I was told I must use an aerobic bacterium every month. Is this not correct?

Here is a website explaining both systems, anaerobic and aerobic and why aerobic should be used:

Anaerobic, Aerobic Septic System, How Septic Systems Work | Aero-Stream®, LLC

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I was told I must use an aerobic bacterium every month. Is this not correct?

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Not according to Modad. Most, (I'd like to say al) septic additives are scams based on "fear advertising" If you don't use our products your septic system will fail. HORSE HOCKEY !! Every time you flush you add more bacteria to your system, These are scams. Don't fall for them.
Good luck, Tom