purchased to replace Whirlpool. produces 20% filtered water with a whirlpool membrane. Thinking the reverse osmosis setup was bad, I bought a new hot tub system ($160). still 20% yield with old "new" (less than 3 months old) filters. replaced the membrane with the one in the new system ---- BINGO, water production back to normal! Stick to whirlpool membranes!
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