Filter Size vs Pump Size

[Wrisk]

So..... The pool volume is 25,000 ish? Cool. Just for info, since I put in a new cartridge the pool is crystal clear. No issues. I just have "helpful" people telling me to get a bigger filter. It sounds like I can put that off for a bit. If I get a c1200, is the 1.5 hp pump ok? Or should I still down size?

[PoolDoc]

@ Carl: Correct vs incorrect flow rates:

[PoolDoc]

So..... The pool volume is 25,000 ish? Cool. Just for info, since I put in a new cartridge the pool is crystal clear. No issues. I just have "helpful" people telling me to get a bigger filter. It sounds like I can put that off for a bit. If I get a c1200, is the 1.5 hp pump ok? Or should I still down size?

As you can see, in the post responding to Carl, the optimal flow rate for a C1200 is 45 GPM or less, far less than the 90 GPM Carl referenced. I'd recommend downsizing the pump, and saving the electrical costs.

Be VERY CAREFUL to clean your new cartridge promptly, when the pressure begins to rise -- don't wait till it's gone up 6 or 7 pounds. The C900 cartridge is more resistant to pleat collapse than the StaRite System3 cartridge shown above, but one it occurs, it's often irreversible. Unlike sand filters, there is no benefit with cartridge filters to allowing the pressure to rise. With sand filters, the dirt becomes part of the filter media during the last half of the filter run. This is not really true, and not at all needed with cartridge filters.

Instructions on how to clean your cartridge, without damaging it, can be found here; http://pool9.net/cart-clean/

[Wrisk]

Thank you for all of your help.

[CarlD]

Thanks Ben. I wasn't questioning your judgement, just looking to see what I was missing in Hayward's published specs. At 34 GPM it's clear the C900 is 'way too small for the 1.5 superpump. Do you think a 300# sand filter would also be a good alternative to the C900? Finding parts to downsize a pump's impeller is, as you know, a PIA.

[PoolDoc]

Actually, both the impeller and the seal are available on Amazon. The real problem is, can it be installed?

Anyhow, this seal:

Hayward SPX1600Z2 Seal Assembly

and one of these three impellers:

Hayward SPX2600C Impeller
Hayward SPX2605C Impeller
Hayward SPX2607C Impeller

But I'd need to see photos of the pool and piping to be sure. Also, the exact Super Pump model number needs to be confirmed. A 1.5HP pump is either a SP2610x15 *or* a SP2615x20.

If the choice is to stay with the existing pump, a matching filter would be a SwimClear C2030, rated at 84GPM commercial.

[CarlD]

Just for ball-park: The c2030 runs about $535 on Amazon Prime. But plumbing it in to replace the C900 should be a piece of cake with PVC fittings--basically a drop-in job.

[PoolDoc]

Direct link:

Hayward C2030 225 Square Foot SwimClear Cartridge Filter

Be careful to purchase from Amazon, rather than a 3rd party if possible. The link above *should* go to Amazon as a seller, but didn't when I checked a couple of hours after posting it.