as a septic installer i have seen these products work sometimes but not always. A customer had a problem , the septic pump company told them the field was plugged and would need a new field (cost$2000.00) I went and had a look and the septic tank was not pumped properly so the outlet pipe was plugged full of soap scum i opened up the d-box it was dry ,i scraped the crust out of the inlet and outlet pipes , used a similar product , septic working fine ever since .i didn't make any money but the customer was happy and i have got more work from there friends.