I have just discovered that there is something under the liner in the corner of the hopper. (The cleaner is hanging up on it.) I sent my son down to check it out. He says it is about 3" long and 2.5" high and has an edge on one side. It just about has to be something the liner installers knocked down there.
The pool is not leaking. Is it best to just leave it alone since nobody will be stepping on it ? I am reluctant to try to tap it down. This is a vermiculite/portland cement bottom.
As always, thanks for any advice.
Love the smileys.