The way most septic systems work is maintaining a balance of bacteria that eats the waste. Too much bacteria then they run out of waste and die creating that black goop you see when pumping out. Too little bacteria and you get undissolved waste. I believe RidX and products like that kill the bacteria. Yeast based products activate bacteria and give it more to eat. It is not always good to pump your septic out often since you are removing the helpful bacteria and it takes awhile to build it back up.
Just my 2 cents
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