According to the plans I have, the system has a single distribution box. I discovered a shower faucet in my daughters bathroom that was dripping big time that I was able to fix (prob 15-20 gal/day!) that may help the wet drain field. For jetting the laterals, do you have to dig out another point besides the d-box? The video I saw only shows them at the d-box but if their is significant sludge where could it go, back to the tank to pump out? I checked out the clog hog and it seems decent for a do it yourselfer. What do you think? Thanks again, -Dave