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Old 08-10-2009, 05:16 PM   #1
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Question.... DI cartidge.
Question... if I test my RO-DI water and I'm getting phosphates in it I assume it's time for a new DI cartridge?

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Old 08-11-2009, 08:01 AM   #2
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Usually, yes. What's the TDS reading?
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Old 08-13-2009, 12:48 AM   #3
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I'm not gonna lie lol I still don't know what the heck TDS is. Is it a term for phosphates or something? rofl.

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Old 08-13-2009, 01:00 PM   #4
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TDS - Total Dissolved Solids
If you have an RO/DI unit, how do you know when it's time to change the filters? You test it with a TDS meter. Ideally, the unit will produce 0 TDS and when it starts to rise, it's time for a filter change.
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