I have a 3-story house with two 10-year old toilet bowls. Both bowls have a somewhat weak flush, but still work fine, though often the bowl needs plunging.
Just recently, I started hearing a hammering noise in the basement pipes when flushing the toilets. Note, this is not after the flush is completed, but as soon as the flush starts. The banging noise will stop once the toilet tank has completely finished refilling itself.
I read on some other forum that the problem is not the same as water hammer. What is this problem exactly? What is the solution?