How often do you replace RODI filter media?

The industry standard is that you should be able to see a PSI drop if the carbon and/or sediment filters are at capacity and needing to be changed. 5 PSI is a good initial drop. There are time recommendations from every single RODI supplier, but quite frankly I have found that it really depends on HOW MUCH water is being filtered in total during the span of a month. If you aren't using it every day, then I don't believe using a timeframe is worthwhile unless you're finding your TDS to correspond with that same timeframe.
 
The industry standard is that you should be able to see a PSI drop if the carbon and/or sediment filters are at capacity and needing to be changed. 5 PSI is a good initial drop. There are time recommendations from every single RODI supplier, but quite frankly I have found that it really depends on HOW MUCH water is being filtered in total during the span of a month. If you aren't using it every day, then I don't believe using a timeframe is worthwhile unless you're finding your TDS to correspond with that same timeframe.
refer to the "chlorine capacity" rating on the carbon block, and assume exhaustion at 50% of that. If your vendor doesn't supply that spec, might want to find a new vendor.
 

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