I have gotten DE into my pool a few times and am getting conflicting information and need some advice-
Times DE went into the pool-
a. the two times I have opened my pool pump some DE entered my pool through the returns
b. When the solar installers cut the pipe to install the three way valve a fair amount of DE sunk to the bottom (also through the returns)
All three times the pool builder told me that it was normal as loss of pressure in the system causes some DE to enter the pool
My neighbors went to Leslie's and their repair man told them that the only reason to get DE in the pool is a improperly installed filter or there is damage to the filter i.e. a crack.
Which sounds right to you?