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?
Please Advise, Mr. Boning