The softener is before the RO/DI unit right? Both carbon and sediment filters should be replaced every 6 months. The RO should be replaced when its product water gets to 20 ppm or less if you prefer. The DI should be replaced as soon as the product water reaches 1 ppm, but double check that it's coming out of the RO under 20 ppm. Do you have a digital TDS meter to test your water? What is the TDS of your tap water after the softener but before the RO/DI?
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~ Mindy
SPS fanatic.
Last edited by Myka; 03-22-2009 at 04:38 AM.
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