Actually, it's a problem with ALL the so-called high capacity cartridges that they started selling over 10 years ago. I think that now, all the companies have them. They just added more and more pleats in the same space, and the structure was not sufficient to support the pleat separation.

This is one of the main reasons why cartridge filters are the poorest of the three options (sand, DE, or cartridge) in most circumstances. There are places where they are needed, primarily where various restrictions prevent any sort of backwashing.

PoolDoc