Got my Intex Plunger valves today. I might be able to use them to restrict flow, but not reliably. I think I have a plan that will be pretty inexpensive tho. I haven't ruled out adding a ball valve just before the pump.

I have some pics of the conversion from the 1-1/4" line cartridge to the 1-1/2" line sand filter I can email if you'd like. I can put together a short "how to" convert, also.

The pool is sparkling clear! Thanks!