Cutting tap water with RODI or remineralize? - The Planted Tank Forum
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post #1 of 6 (permalink) Old 02-07-2018, 10:39 PM Thread Starter
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Cutting tap water with RODI or remineralize?

I finally decided to suck up the cost of an RODI unit and I was wondering if it makes more sense to cut my existing well water or just remineralize. Coming from the tap my water has a TDS of 350 so I'd probably bring it down closer to 200. My tank only has neos in it and they've been fine at the higher TDS but I'm tired of hard water deposits everywhere. I know my well water is high in silicates and low in iron. Ammonia, nitrites, and nitrates are zero.
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post #2 of 6 (permalink) Old 02-07-2018, 11:09 PM
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IMO it's much easier to just remineralize. Much more consistent too, since you can remineralize to the same TDS each time. Plus you eliminate the contaminants in tap water.

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post #3 of 6 (permalink) Old 02-09-2018, 09:14 AM
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Either way works well. Unless your dealing with shrimp or certain syngonanthus and erios. So don't listen to axelrodi202, he does not know...
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post #4 of 6 (permalink) Old 02-09-2018, 01:32 PM
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If you're happy with your well water and just want it softer then I'd just mix the two. If there is other stuff in it you want to get rid of or you want very exact control over your water then remineralise.

I wouldn't just rely on TDS though, check the GH/KH of your well water and mix with RO to what you want in the tank. Then test the TDS of the result and mix to that in future. TDS is everything so technically you could be low in GH and high in something else i.e. your TDS 200 water could have a very different contents to my TDS 200 water.
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post #5 of 6 (permalink) Old 02-09-2018, 03:26 PM
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Quote:
Originally Posted by Axelrodi202 View Post
IMO it's much easier to just remineralize. Much more consistent too, since you can remineralize to the same TDS each time. Plus you eliminate the contaminants in tap water.
I agree with Axelrodi. If you have the set up to store enough water, then I would do that and remineralize.

I'm also on a well. Much of the higher TDS is from the sodium, I'd prefer to get rid of it.

The KH from well water can also vary by the season, so you really need to keep on eye on it. I like to be able control everything and get the parameters where I want them.


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post #6 of 6 (permalink) Old 02-10-2018, 06:01 PM
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Since switching to RO completely at work for about three months now, I have noticed almost all of my plants have done better. I have not changed dosing or anything else.

It's a great thing to test for a while and see how it does for you. I'm so pleased that I'm now doing it in other tanks and am seeing the same results. Even though our TDS from tap here ranges between 15-45, we have fluoride, cryptosporidium treatment, and a bunch of other junk they add in that I'm beginning to wonder if that has been affecting me for a while. Just cutting tap may not be effective enough.
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