Need advice regarding cartridge filter...

[mas985]

The cartridges I was quoting were the Hayward SwimClear and the Pentair Clean & Clear plus. You can see the curves here:

http://www.hayward-pool.com/pdf/manu...xx25-C7000.pdf
http://www.pentairpool.com/pdfs/CleanandClearOM.pdf

But this cartridge has even lower head loss:
http://www.pentairpool.com/pdfs/cleanclearrpOM.pdf

But you are right, there are some lines that are worse. I would never recommend those since they are usually pretty small.

As for cleaning a cartridge, I would never use a pressure washer. I use a small nozzle on the end of the hose which doesn't damage the fabric. That is probably one of the reasons why my cartridges have lasted so long (> 8 years).

[PoolDoc]

I think it's pretty clear that there are some serious weaknesses in specific models of filters within each filter group . . . and that information about these problems is hard for new pool buyers to acquire. It's something I'd like to work on, hopefully with your help.

Sorting out the whole problem with configuring and servicing electronic controls is out of my reach, at least for now. But I think we could do something useful with filters and pumps, that would help people make better decisions, and have better experiences with their pools.