Quote:
Originally posted by Randy Holmes-Farley
tecoral is right on with his numbers... most people start replacing filters and resin around 6-7
IMO, you are crippling the effectiveness of an RO/DI if you are going to let that much crap get through. The first things to break through an RO/DI are likely to be some of the things that you most do not want getting through (ammonia and silicate, for example).
I detail why you should replace the DI as soon as it rises above 0 ppm TDS in this article:
Reverse Osmosis/Deionization Systems to Purify Tap Water for Reef Aquaria
http://reefkeeping.com/issues/2005-05/rhf/index.htm
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Thanks Randy, I guess I will start changing resine even sooner than 5. Thanks for your input.