I have installed several Kohler 6l low flush toilets and had no problems excpet on the main floor. I frequently experience blockage and believe something is stuck down line past or at the Y connecting from the top floor which is about 3' down line. After several bouts of plunging and snaking recently while painting I removed the toilet, ran a golf ball through it and found nothing. I have used a heavy snake on a crank handle and a have 20' auger drill version as well but am thinking its time to cut into the ABS at the trunk line. 6' past the y is a second branch to the main drain pipe. Any tips before I proceed with surgery?
Thanks but been through that checklist already and have installed a lot of similar smaller pipe correctly in other homes so I know about the elbows. Very certian the blockage is occuring past the toilet and gasket as it does not overflow.