1 of 2 toilets back-up.

[email protected] considering the fact that the other toilet flushes just fine, I suspect that there may be a clog in the sewer pipe serving the non-flushing toilet. If the problem was in the septic tank, neither toilet would flush.

I recommend that the septic tank sludge be measured, and if the sludge depth is 1/3 (or greater) the total liquid depth of the tank, have the sludge removed. The sludge depth can be measured with a device called the “Sludge Judge.” Conduct a “Google” search with the key words Sludge Judge to obtain this neat device. Alternatively, staple a piece of terry cloth to a wooden stick or pole of sufficient length to extend to the bottom of the tank. Just wrap the end of the pole with 2 or 3 feet of terry cloth (like a bath towel) and lower the wrapped end to the bottom of the tank. Let the pole set in the sludge for about an hour, and then carefully remove the pole. The very black slimy crap (sludge) will be caught in the fibers of the terry cloth. Measure the depth of the sludge in the terry cloth and then proceed accordingly. The sludge depth should be measured annually.