New to forum, black algea problem.

[PoolDoc]

Do not use any more algaecide. No algaecide is completely compatible with chlorine; even polyquat, though it's more compatible than most.

The ultimate results of using anyone's phosphate remover will be the same, but apparently the Kem-Tek product I linked costs 1/2 to 1/3, per unit phosphate removed, of what the Pool Perfect products cost. Keep in mind that neither borax nor phosphate removal is a solution; both simply make it harder for black algae to recover from damage done by chlorine.

If you can post the EXACT model and make of your filter, I can possibly help you find a higher quality replacement cartridge that will do away with the need for a DE filter.

[PoolDoc]

Note that I corrected the error recommending AquaChem strips. Fortunately, what is shown on the test page, it shows LaMotte and that's correct.

[lucas2]

Honestly, I think I want to upgrade my filter. It is time for new cartridges and the pool store wants $200+ for a set. Now is the time, I can get a hayward pro grid for a couple extra bucks. Mine is a clean and clear plus 40. I hate it. No back flush. When removing phosphates I have to disassemble and clean sometimes daily. I think I will replace with a 60.

[PoolDoc]

Not finding that model; here's the Pentair brochure: http://www.pentairpool.com/pdfs/cleanclearplusDS.pdf

There is a CCP420 and there are some Clean and Clear filters (no "Plus"), but the lowest they go is a CC50.

The Hayward Pro Grid is a DE filter. Have you ever used a DE filter? They are not very forgiving, and can be rather messy to service.