Brs stage 7 rodi

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Jdadams

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Having an issue with my rodi unit. I bought it used from a local reefer and it work fine. All filters and resin is new and when I run water through it I get a ready of 30 tds going in to the resin on line 3 and line 2 and 1 I’m getting a ready of 1 tds. Why can’t I get zero?
 
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Jdadams

Jdadams

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I had my in and my out mixed up on the resin canisters. But when I switched it and on line 2 I get zero and line 1 I get 2.
 

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So your output is 0? It's normal on a 3 stage DI to have low ppm in between stages.

Note that you must have high input (source water) TDS to have 30 ppm after the RO unit. At 95% min efficiency of the RO membrane that's got to be 600 ppm in your source water.
 
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Jdadams

Jdadams

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Line 3 is 30, line 2 was 0 and line was 2. I just changed out the last 2 resin canisters so I will let the new resin run for a bit and see what I get. I’m new to the rodi stuff, I’ve always just baught pre mixed
 
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