We just had a service call because the house drains were backing up. Turns out there was a mass of root fibers where the line came into the tank. I'd like to install "risers" that make access easier for service and harder for roots. Problems with buying them
1) they all seem to be too small, our tank caps are at least 24" diameter. Few are that big.
2) for a 12"-16" section of what seems to be plastic pipe, they want $300-500, another $100-150 for a plastic lid
3) now they all seem to be plastic and not just a concrete tube.
I'm thinking of getting something like retaining wall blocks and building my own, mortaring them in a stack. I might have to make a form and pour concrete to make a cap.
Is there a better solution?