Quoting from the FAQ Ed @ Aquasafe recently resent me:
Quote:
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Flush once a month for 10-15 mins. For normal water. High Calcium...well calcium cakes everything...membranes are no exception....high TDS....some customers have 1800...flush early and often. Low PSI...early and often.
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The DI will slowly change colour, but TDS is really your best guide, I suppose.