What is the minimum hp pump that will work with this filter?

You want to find a pump that can match the max flow rate of the filter.

Would this work for an above ground pool? If not,why?

I believe this would work fine for an above ground pool but would be way overkill. I use this on my 32,000 gallon in ground pool. I would get something much smaller for above ground. You would want to check the flow rate from your pump as well.

Which multiport valve matches this filter model?

There is no multiport valve with this cartridge filter. No need to back flush. Valves for draining are installed in the line rather than a typical multiport.

ASIN	B089YXR27N
Best Sellers Rank	#34,332 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #95 in Cartridge Pool Filters
Item Weight	74 pounds
Item model number	75202
Manufacturer	XtremepowerUS
Package Dimensions	39.5 x 24 x 24 inches

XtremepowerUS 425 SQ/FT Pool Cartridge Filter In-Ground Above Ground Swimming Pool and Spa Filter System (4-Pieces Filter Set) 2" Inlet/Outlet Fitting

Description

Specifications

Common Questions