"Mr. Boning" wrote in message oups.com...
I have a 7,200 gallon in-ground fiberglass pool (12x20x4). There is 2"
PVC plumbing to the pump (Hayward SP3020EE). The pump has a 2 HP motor.
There is 1 1/2" PVC plumbing from the pump to the filter (Hayward
C1100). The exit plumbing on the filter is 1 1/12" PVC which goes back
to the pool. I acquired the pool and equipment used almost 6 years ago.
The base of the filter system is now leaking and needs to be replaced.
Based on the information I am finding around on the internet, I could
downgrade to a C-250 and I would still be over the minimum requirement
for a 7,200 gallon pool. The only thing that worries me is if there
would be too much pressure from the pump for a smaller filter system. I
have asked several people working at pool stores in the area. As soon
as I let on that I currently have the C-1100, they start salivating and
assure me that I should replace the equipment with at least the same
size if not bigger. But I don't get a good feeling that their
recommendations are based on something other than greed. Is there
anyone out there that really understands the water pressure involved
that can verify if a 2 HP motor will really cause too much pressure for
the smaller filter system?

I believe that filters are rated for the volume they can handle. Similarly, pumps
are rated for output volume at given pressures. As long as the filter is designed
for the rated pump output, you should be fine.

http://www.haywardnet.com/products/d...m?ProductID=11

I did not find your filter. That pump pushes a lot of water, so a small filter might not be
a good idea.

Bob