bottom line - any time you over restrict a membrane, you risk shortening its life span.
Plumbing two membranes in series, and over restricting them gives you the same situation.
If you want water faster, we typically prefer to plumb the membranes in parallel, with a flow restrictor on each. This way we can adjust/control the ratio as needed on each membrane. If we plumb membranes in series we are careful to install a flow restrictor that yields the correct waste to purified water ratio.
Russ
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