Toilet drain question
My daughter bought a 1915 house recently. The bathroom is in an addition--porbably from the 1940's or so. There is a cellar under the bathroom so I can see the pipes and have free access to them.
We noticed that her toilet gurgles when flushed and seems to siphon out too much water. There is not much left in the bowl after flushing. The drain coming out of the toilet is a 3" ABS drain which drops straight down for about 18" before joining with a horizontal pipe leading out.
I am wondering if we need to replace the toilet, or if the drain is pulling too much water out too fast when the toilet is flushed. Any advice?