Lol I change pre-filters every 2 months or so and get 6 months to a year out of my membranes.
But I also make over 100g a week with well-water. Its all about the TDS. Get a pen or meter or some sort. I use two different pens to test/confirm.
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No more tanks  - Laying off the ReefCrack for awhile!
Cheers,
Chris
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