[Then there are the low flow toilets. You have to flush them twice to get them to work.]
I drilled out the bowl fill tube orifice to put more water in the bowl during a tank refill between flushes.
Can’t modify all of them but did it on a Kohler Highline.
Gives you about another 1/4 gallon for a better flush.
Long runs of 4” lead caulked cast iron waste lines in some houses are really becoming problematic with clogging from these low flows. Not enough water to fully flush them out between flushes so it just builds back and clogs. One house I had to tear out about 25 feet of it and replace it with 4” plastic pitched higher to the house trap.
They could actually downsize to 3” now with the same amount of toilets on a line.
One customer that I did the above toilet modification for had clogs two to three times a year. Now none.
Absolute nightmare.
I just installed three Koehler’s with the extra built in flush. Still have to swab it always with solids.
I thought I dropped a ring in the toilet so my plumber friend came out to look for it. He said wow your lines are clean. Apparently we have more water flow than is recommended/allowed? Shhhhh!! Lol