Question.... DI cartidge.

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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.

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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