I have a slab on grade home that we built in 1988, we remolded the master bathroom about 7 years ago and ever since have had problems with the sewer line from that bathroom clogging up, it’s the longest run and has a slight low point belly according to several plumbers who have videoed it, they say the flow is slow. The most recent plumber recommended a pressure assist toilet- the thought process being that when we built the house the toilet was probably a 3 gallon flush and now we have a 1.28

or,

you can fix the pipe so that it works properly


ie: proper pitch ALL THE WAY

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"Measure Twice & Cut Once" - Retired U.A. Local 1 & 638

in this situation, i believe the plumbers.

Unfortunately the pipe is cast in the concrete slab, very long run all the way through the master bedroom

{tough love deleted}

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"Measure Twice & Cut Once" - Retired U.A. Local 1 & 638



Edited 1 times.

Get a gravity fed toilet with a 3" flapper style flush valve and modify the internals of the tank to use more water.

Pressure assisted can not be modified, are noisy, and are about on their 5th recall. IMO they are a pain.

I have done this on many jobs with 99 % success. The one failure was 100' of 45+ year old 4" cast iron line in a office/public use (no control over what is flushed) building with many low spots. Re-lined sewer line and no problems since.

I used to use the Toto Drake but they changed it to a canister style flush valve. I now use a ProFlo model. I can get about 2.50 gallons per flush. Makes a lot of difference in line carry.

This is a inexpensive try compared to replacing/re-lining existing sewer line. Which you may have to do.

Good luck.

i like that advice

I have a similar situation in our 1/2 bath on the lower level. The house was built in 1980, and the waste line runs a decent distance under the concrete before it connects to the main waste line. The toilet is designed to close the flapper after about half of the tank empties, so you conserve water on every flush. If you are flushing #1 it works fine. With #2, there is not enough water to carry the waste to the main. The "fix" is to hold the flush handle down until the tank empties when flushing #2. The extra water is just what is needed to float the solids through the line. So we didn't have to modify the toilet itself, only how we used the toilet. A new toilet is on the list for a planned remodel.