5600 is the wrong thing for KL and a 10 inch tank. It's close. What you should try next is removing the BLFC washer, and do your measurement again.how do I increase the backwash to 8.1 gpm when from what I'm seeing the fleck 5600sxt only goes to 5 gpm! (why do they sell it like this!)
There was a really good thread on this, that I might find. https://terrylove.com/forums/index....a-replacement-and-backflow-rate-issues.87918/ is good too.
Watch the pressure gauge during the backwash, and make sure it stays above 30 psi.
A 3/4 inch drain line may be worthwhile, or at least make sure your 1/2 inch is not restricted. It really should be 3/4, increasing as you exit the valve.
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