I can't figure out why I have blown my second filter. I have a Doughboy AG 32x16, Pentair Whisperflow 1 HP single-speed pump, Pentair Intellichlor SCG and 24" Aquaview sand filter. The plumbing is 1 1/2". Even with my first filter, brand new, the PSI was at 23. I expressed my concern to the contractor who built the pool and was told every pool fluctuates. The mylar label on the filter indicates not to go beyond 26 psi (!!). I have read on this site that if the psi goes past 10 from a clean filter reading, it's time to backwash the filter. My gauge never changed, and I backwashed regularly - couple times per month. Both times, the filter ruptured at the seam. My "contractor", whom I have found had an expired license during the installation, replaced the first filter with an attitude that he was doing me a great favor. The last time I called him (rusted plates at top of pool after only 9 months), he hung up on me. This is a Doughboy representative! I also contacted Doughboy, sent an e-mail to the CEO and was replied with "what size is your pool" and "the SCG voids all warrantees".
So I digress....
Any thoughts? Please?