Hi All,
I am looking to buy a new DE filter but noticed some of the more expensive ones use a cartridge style filter (Pentair Quad 4) as opposed to the standard filter configuration (Pentair FNS plus). Can anyone explain what the main differences between the two are?

Here are some links,

http://www.pentairpool.com/misc/pdfs...rs/Quad_DE.pdf

http://www.pentairpool.com/misc/pdfs...lus_filter.pdf

Thanks,
J.