I have a 2" steel casing with PVC pipe going down to the jet, check valve and leathers. The well pump is cycling too often. I checked and water is going back down the well past the leathers and check valve. I tried to pull the drop pipe to change everything, but the leathers are stuck inside a coupling on the 2" pipe. I can go down but not up past that point. I was told to pour bleach down the well for a few days to eat up the leathers, but it hasn't worked. The pipe is still stuck at that point. Any ideas?