Quote:
Originally Posted by Larchap49
Definitely can be a problem after installing low gallon use toilets if the drains don't have enough pitch. I had that happen in last house. I had to go back to 3.5 gallon toilets because the drains under slab were too flat and the solids would stop due to lack of water to keep everything moving.
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Federal law requires all toilets manufactured to have a flow rate of not more than 1.6 gallons per flush. That law has been in effect for 28 years.