We've been having an enormous amount of trouble with our DE filter since we got our house. We're in our third season and the last two we have limped through but this year the pool is beating us! Our filter is old. It's an Anthony Apollo VA38. It has 6 filter fingers. We constantly have blowback and have to open the tank and clean and reassemble the fingers. This year as soon as we start the filter, the pressure rises to 20psi almost immediately and the whole assemble pops up off of the feed tube. My theory is that I'm not getting good flow thru the fabric. Can these be restored with the filter cleaner or is it likely that I need to replace the fingers? When the water is not run thru the filters, the pressure ramains at 10psi, which eliminates up or downstream blockage or breather tube malfunction. What say you?