Did you install a flow restrictor in the line? If the correct one is in there, you will get 100gpd with 400 gal waste. The flush valve should only be used to back flush the membrane, otherwise it should be shut off.
If you do not get 100gpd form a 100gpd membrane, then either your feed water pressure is too low, or the temp of incoming water is too cold.
I don't have a flush valve, the last membrane lasted 3 yrs. I have been debating whether I should instal one, but some co. speak against flushing.
So until I can research more, I won't backflush.
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