I would flush your filters, usually you need to do this once a month or every 1000 gallons (something like that). Your instructions should show you how to do this, with mine it is just a matter of reversing the lines on the membrane and letting it run for a bit, then putting things back as they were.
My water is ~200 ppm, but once filtered it is only 2-4 pmm. The great thing is that this is without a dionizer (only Reverse Osmosis). My unit is the Coralife unit.
if you take care of your filters and membrane they can last a long time.
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