13,
Here is my story that I have shared before.. I have two rent house pools that had DE filter when I bought the houses.. A few years later we decide to install a pool at my house. I really,, really wanted a DE filter, but my City requires the back wash to go into the sewer which was almost impossible due to access.. I reluctantly accepted a large cartridge filter.
Now, 7 years later, I can't wait for my DE filters to die so I can replace them with large cartridge filters.
No messing with DE, no backwashing at all.. No multiport or backwash valve to go bad or leak. Dirt simple plumbing.. Low back pressure, so I can run my pump slower and still move plenty of water.. I clean the cartridges twice a year, but could easily go a whole year if I wanted.. Keep in mind we do no close pools here in Texas.
The idea that the DE filter can filter smaller particles is technically true, but just makes no appreciable difference in the water quality.
That is my story and I'm sticking to it...
If you go cartridge get the biggest one you can afford..
Thanks,
Jim R.