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2 membranes would get it down to about 12-15 at a rough guess, 3 would probably get to zilch for there best days. I'd go for 3 axeon 100 gpd's, from daqua, I have 2 but only about 200 tds, gets me to 3 at the mo.
Could go for a 40-40, but have no info whatsoever on them
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