Question What does DI do

Tofa

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Hi
My Nitrates out of the tap are ~40ppm so I use 50\50 tap water and RODI

I've seen the Pozzani nitrate filter but the cartridge just looks like DI resin

Just wondering if the DI cartridge on my RODI unit is the same, so I could pass tapwater through the DI unit only and end up with nitrates at 0ppm(ish)

Thanks
 

AngryRainbow

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Di can be considered as the final water polishing stage of your filter. I would not recommend running unfiltered water through your di filter as you'll use up the filter very fast if the water isn't first purified by the ro unit. Plus I don't think the resin will selectively just remove the nitrates, it will remove more from the water and that DI water won't remineralize your 50% RODI water properly. If you want zero nitrates in the water, you could always use 100% rodi water and remineralize it.

Also depending on what you're trying to achieve, you may not need the di filter. It's oftentimes not necessary to achieve that level of purity in freshwater tanks. I personally use RO water in my tanks. The water comes out of my system at around ~35 ppm TDS (my well water starts off at 1200-1500ppm) which I remineralize and it causes no issues.

Here's a webpage that explains ro vs di
 

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