The main plumbing in our house is copper. The water comes out of the well pump (60 psi) into white plastic (Schedule 40?) line and then flows through Schedule 80 piping to a retention tank and then through Schedule 80 piping again to copper piping to the filtration/water softening tanks which have Schedule 80 joins then back out into the copper lines to the house. Our well water has a lot of sediment and iron in it but generally no other harmful chemicals.
The first two leaks occurred when the Schedule 80 pipe cracked at the join with both the filtration and water softening tanks. The first plumber appears to have replaced the Schedule 80 pipe with Schedule 40 pipe and it seems to have fixed the problem (although our second plumber is confused as to why Schedule 40 would work when Schedule 80 did not). The third time we had a failure it was at the elbow join between Schedule 80 piping from the retention tank into the copper house lines. The join split completely.
I am just curious if anyone else has experienced this and/or if you might have any explanations why this occurred or what to do to prevent these breaks from occurring in future. Thanks for any information!