How much RO/DI? - The Planted Tank Forum
 
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post #1 of 9 (permalink) Old 02-03-2018, 06:59 PM Thread Starter
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How much RO/DI?

Hello,

New to the forum and new to planted tanks. I have never (successfully) had a planted tank, but have african cichlid tanks, but would like to convert my 35gallon hex tank into a planted tank. Besides my issue trying to figure out proper lighting for this tank, I have hard well water. 12 dKH and 20dGH. I have a RO/DI 5 stage filter and was wondering is my best bet mixing DI water with my existing well water and if so what ratio should I do well to DI. I plan on growing low to medium low light plants and making a DIY CO2 generator. Any help would be greatly appreciated.
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post #2 of 9 (permalink) Old 02-04-2018, 08:10 PM
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If your well GH is 12 try a 50/50 mix. that should reduce the GH to about 6. but confirm that with a GH test kit.
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post #3 of 9 (permalink) Old 02-04-2018, 08:18 PM
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Usually we try to get the KH in the 4-6 range and GH in 6-10 range. So anything from 50/50 to 35/65 will be good (tap/RO proportions).


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post #4 of 9 (permalink) Old 02-04-2018, 08:23 PM
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GH is 20, KH is 12.

Both GH and KH are refering to concentrations (in one form or another). RODI water should 0 GH and KH. From these, it means we can use simple formulae for dilutions. All of the below are volume ratios, well:RODI

1:9 - ten fold dilution - GH 2 KH 1.2 (By and large too low unless you specifically know some fish or plant require this )
1:1 - two fold dilution - GH 10, KH 6 ( Most economical, works with many plants)
1:3 - four fold dilution - GH 5, KH 3 ( Seems to be targeted by many with high tech tanks)

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post #5 of 9 (permalink) Old 02-04-2018, 09:47 PM Thread Starter
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Thanks! I wasn't sure if a simple dilution ratio would work, especially after I start adding CO2. Will CO2 affect the gh or kh? or just pH? Since I don't think I can do high light plants CO2 may only be 2 bubbles/s. With a dGH of 20 and dKH of 12 how do I get the values where I want them?

Thanks again
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post #6 of 9 (permalink) Old 02-04-2018, 10:26 PM
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No, CO2 will not influence GH and KH. But higher KH, typically results in higher pH, the reverse is not true.

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post #7 of 9 (permalink) Old 02-26-2018, 07:26 PM Thread Starter
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What is everyone's opinion on diluting with RO/DI? With the high gh and kh will it have a great benefit diluting by say half RO and half tap water, or would I be better off using straight tap? I have the RO/DI system so making the water is not a big issue, though I do not know how I am storing it yet, but if plants will still do really well in my tap, I am not sure I want to do this.

Any advice welcome. I am thinking filling 7 gallon buckets I have with 50% RO and 50% tap and pumping the water into the tank after I do a wc.
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post #8 of 9 (permalink) Old 02-26-2018, 07:41 PM
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With your GH being that high, I'd dilute because it can limit the fish you can stock. I used to run straight tap, mine had a GH of 13-15...I couldn't keep certain fish alive. Oto's would only last a few days, neon tetras didn't thrive. I made the switch to RODI and haven't lost an Oto since, other fish seem to do much better in general as well.

I go the remineralization route vs dilution, using CaSO4 and MgSO4 to raise GH to 4-5, and I use nilocG's ReKHarb to raise KH to 3. It allows me complete control and fine tuning. Your well water is free though, and probably fairly consistent. 1:1 mix would be fine, I'd actually go with more RODI though to get that GH closer to 6. Hard enough for all your plants and inverts, not so hard as to limit your stocking.
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post #9 of 9 (permalink) Old 02-27-2018, 03:43 AM Thread Starter
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Quote:
Originally Posted by mgeorges View Post
With your GH being that high, I'd dilute because it can limit the fish you can stock. I used to run straight tap, mine had a GH of 13-15...I couldn't keep certain fish alive. Oto's would only last a few days, neon tetras didn't thrive. I made the switch to RODI and haven't lost an Oto since, other fish seem to do much better in general as well.

I go the remineralization route vs dilution, using CaSO4 and MgSO4 to raise GH to 4-5, and I use nilocG's ReKHarb to raise KH to 3. It allows me complete control and fine tuning. Your well water is free though, and probably fairly consistent. 1:1 mix would be fine, I'd actually go with more RODI though to get that GH closer to 6. Hard enough for all your plants and inverts, not so hard as to limit your stocking.
Thanks for the reply. Makes sense. Prob doing cardinal tetras or emperor tetras and cherry barbs.
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