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Old 07-30-2009, 09:00 PM   #1
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TDS meter reading

I have my own RO/DI unit. Bought it about 6 months ago. Figured it was time to change the filters so I bought new filters and a dual inline TDS meter.

I decided to test the current reading before changing any filters.

Here are my results...

IN: 265 ppm
OUT: 11 ppm

I know the desired output is 0 ppm but is 11 ppm in an acceptable range or should I change the filters now?


90G RR, 20L Fuge, 50+ lbs LR (more planned), 55G Sump, Mag 5, Rio 3100, ASM G3, Outer Orbit 2x150w HQI/T5, UV Sterilizer, Hydor 3

Fish - Tomato Clown, Black Chromis Planned - Green Mandarin, Corals, few more..
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Old 07-30-2009, 09:46 PM   #2
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I would say that is acceptable I would change the filter when the output PPM reaches 25.

Go Team Insomnia!
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Old 07-30-2009, 10:23 PM   #3
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Not shabby at all. I really need to test our's again since the cartridges are a good bit older than last time. Thanks for the reminder!
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Old 07-31-2009, 01:25 AM   #4
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I'd guess your membranes/filters are fine, but you need new DI resin. With good working DI resin, there's no reason your output shouldn't be zero.

If you can, take a sample of water just before the inlet of the DI stage and see what the TDS is. If it's the same as the DI output (11 ppm), then it's time for new DI resin.
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