From PacFab engineering bulletins I received in the early 90's:









When I was running flows over 60 GPM, I always switched to the PacFab Full Flo valve, now called the "High Flow Valve":
http://www.pentairpool.com/products/...w-valve-68.htm

Over a 100 GPM, I made backwash valve chains, using an H-ladder and 4 full port ball valves.

It's also worth noting that neither sand nor DE filters have a failure mode that approximates cartridge pleat collapse, illustrated on a System3 cartridge:



(This cartridge also shows the effects of cleaning with a low power electric pressure washer. The pleat collapse results from high pressure drop across the cartridge that results when the filter clogs with algae or dirt. The 'fuzzy' fibers are a result of the pressure washing.)

Once that failure mode has been achieved -- and I've seen it on EVERY modern "high capacity" cartridge that's been used even briefly on dirty pool water -- the cartridge cannot be restored, and pressure drops are far greater than with the new, un-collapsed, cartridge.