I have a Pentair FNS 60 square foot DE filter on an inground pool. Anyone have any problems with internal corrosion on the SS nuts that are used on the rods that holds the filter grid assembly together? The pool is a salt water pool that is just now 5 years old. Today when I disassembled the filter I noticed that the nuts that hold the SS rod to the bottom grid rack were corroding. One just crumbled apart when I tried to remove it. The rod hasn't corroded at all. Both nuts on the each of the 2 rods had corroded. Neither rod had any corrosion on it. I haven't had any issues with pool chemistry. Chlorine and PH numbers are normal and salt is ~3000 ppm. Chlorine generator is working fine and no other problems with the pool.
Anyone have any ideas?
thanks-
DH
Anyone have any ideas?
thanks-
DH