Kh and pH relationship using RO? - The Planted Tank Forum
 
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post #1 of 11 (permalink) Old 04-19-2010, 06:44 PM Thread Starter
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Kh and pH relationship using RO?

So I'm doing top offs and water changes with RO water.. For top offs I just pour the straight RO water in there with nothing added. For water changes I use seachem equilibrium. But for kh I just added a little baking soda to the new water.. Now the RO water that's going into the tank is at 6-7 GH, 4 KH, but the pH is reading at like 8.0.. Before I put the baking soda in there was no KH reading and the ph was ph<5.. My tank for some reason started with 4 kh and now is up to about 8-9 and the pH is 6.8-7.0.. After the water change the pH is around a 7.5 and the kh is 5 in the tank. Is this to much of a ph and kh change in a short period to effect the livestock in the tank? Is this normal, heh? I would guess that slowly the CO2 will lower the ph over the next couple hours back down to 6.8-7.0 but what does everybody think.. I'm new to RO.. Thanks.
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post #2 of 11 (permalink) Old 04-19-2010, 06:45 PM Thread Starter
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btw, the fish and shrimp seem to be doing fine..
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post #3 of 11 (permalink) Old 04-19-2010, 06:50 PM
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You're adding baking soda and equilibrium both? You don't need both...

And sounds to me like you may be adding too much.

Watch your kH and gH rather than your pH, since that will fluctuate with your CO2.

You need to maintain stability. Are you premixing your water change water before adding it to the tank?





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post #4 of 11 (permalink) Old 04-19-2010, 07:03 PM
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Check the ingredients of equalibrium.. its mostly Ca/Mg, similar to backing soda.

My tap water is acceptable, just to hard (20 GH)... I mix up pure RO, then add tap water until I'm at 100 TDS - My tap water alone is about 350 TDS.

Just how I chose to do it, being stable I think is more important then hitting a magic number I think.
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post #5 of 11 (permalink) Old 04-19-2010, 07:20 PM
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Quote:
Originally Posted by markw78 View Post
Check the ingredients of equalibrium.. its mostly Ca/Mg, similar to backing soda.
Not at all similar, they are not even close. Baking soda is sodium bicarbonate that is it.

Equilibrium has calcium, magnesium, potassium, iron and manganese (no sodium bicarbonate) and will raise only the GH.

Baking soda is used to raise KH (carbonates). Carbonates buffer the pH.

Fish are less concerned with KH and pH but do prefer stable conditions, shoot for stability not a fixed number. Changes to pH from CO2 have no effect on livestock.
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post #6 of 11 (permalink) Old 04-19-2010, 07:21 PM
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Equilibrium and baking soda are not the same thing. Equilibrium is mostly Ca, Mg and K and affects your GH. Baking soda is sodium bicarbonate which will raise your pH and KH. I would forget the baking soda altogether, you don't need it. Equilibrium you can dose according to the label directions to raise your water to whatever GH you feel is necessary you just need enough Ca and Mg to keep the plants happy and as far as the fish most important thing is maintaining a relatively stable GH at water change time.
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post #7 of 11 (permalink) Old 04-19-2010, 07:56 PM Thread Starter
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Right on, thanks for the help. I am premixing it before I add to the tank.. Ok worrying about the kh and baking soda is out. Also, my gh is 11-12, should I add enough euqilibrium to get it around 10 so that there isn't such a gap between existing water the new water? I added the recommended amount and it only got the new RO water to about 6 GH.
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post #8 of 11 (permalink) Old 04-19-2010, 11:58 PM
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I think 6 is fine. I'd just try and keep it the same since it can stress your fish if TDS is jumping around.

Last edited by Jeff5614; 04-21-2010 at 03:03 AM.
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post #9 of 11 (permalink) Old 04-20-2010, 03:30 AM Thread Starter
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Thanks jeff.. Sweeeet tank by the way.
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post #10 of 11 (permalink) Old 04-20-2010, 06:42 PM
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I am jealous (sort of) of you people with low kHs. Its kH = 14 here at the minimum.

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post #11 of 11 (permalink) Old 04-21-2010, 02:51 AM
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I always add Equilibrium and baking soda to my RO.
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