Replacing D. E filter with cartridge filter /Hayward.

jeanft · Mar 17, 2016

Well it's time to replace this old metal D.E filter 60 sq/ft( Pac Fab Nautilus S Steel NS-60), rust and pinholes/salt water. The pool is around 25000- 30 000 gal .
Looking at Hayward Star-Clear cartridge filters C900 or C1200. After a few phone calls, could not find an answer pointing to which one to use.

C751	75 ft²	flowrate 75 GPM	gallons 36,000 8h	45,000 10h
C900	90 ft²	90 GPM	43,200 8h	54,000 10h
C1200	120 ft²	120 GPM	57,600 8h	72,000 10h

I am using a weak chinese pump rated 1.5 HP which brought pressure from 10 to 5. Very poor stream out coming from jet. Will replace it.

What would be a good recommendation for the pump? The pipes are 2" wide now with adapters to 1.5" on pump. Use 2" all along as well on filter?

Thanks

JF
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jblizzle · Mar 17, 2016

Welcome to TFP!

Forget the flow rates listed on the filter, they are maximums. You want as large of a cartridge filter as you can get for your large pool size and long summer season. 120sqft is way too small. You should have something around 400sqft.

gwegan · Mar 18, 2016

I agree with Jason. Around 450 sq feet. Clear water and requires serving twice a season.

jeanft · Mar 20, 2016

gwegan said:
I agree with Jason. Around 450 sq feet. Clear water and requires serving twice a season.

Thanks. I get idea. Four large filters inside. What about a sand filter? Less work it seems...

Patrick_B · Mar 20, 2016

I love Sand filters. they work well, and are easier to my mind to care for.

jblizzle · Mar 20, 2016

Sand would be fine, but again you should get a quite large one, like 30" diameter.

gwegan · Mar 21, 2016

Sand Filters are fine. Again you want to oversize for best operation. Because you have had a DE filter you may notice the water is not as clear with a sand filter.

Brett_N · Mar 21, 2016

Go big - Hayward C5025 if you can find one.

Cartridge filters are about $200 every 5 years or so. Cleaning is easy, but I recommend a "Filter Flosser" ($25 from amazon) to speed up the job.

I have no where to backwash to, so cartridge is my only real option.

Patrick_B · Mar 22, 2016

If you go cartridge, and consider 400 sq ft, you might as well go with a 525 sq ft. It won't hurt to have more.