RO/DI High pH after Remineralization. - The Planted Tank Forum
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post #1 of 10 (permalink) Old 07-18-2018, 08:06 PM Thread Starter
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RO/DI High pH after Remineralization.

So, as title suggest I get a high pH ( around 8) after Remineralizing the RO/DI water.

I really do not understand why..

My RO/DI water comes out between 0 and 1 TDS.

For every 13.2 US gallons I put the following :

- 0.8g Calcium Chloride
- 4g Calcium Sulphate
- 4g Magnesium Sulphate
- 1.4g Potassium Carbonate

I end up with this parameters in the bucket:

- GH= 6
- KH= 1.5
- TDS= 120
- Ph= 8 (more or less, color based test)

Did I miss something?

I decided to switch to RO water since my water here has 450 TDS
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post #2 of 10 (permalink) Old 07-18-2018, 08:11 PM
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You did not. Disregard that pH test, re-test after ~24 hours. You remineralize to lower values than I do (GH 6, KH 4) and my pH is low-mid 7's after water sits. I don't ever let it sit though, I just add it in.
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post #3 of 10 (permalink) Old 07-18-2018, 08:15 PM Thread Starter
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Thanks alot for the fast reply mate!

Is my first time doing this so I'm overly paranoid I guess.

I was aiming ideal parameters for Taiwan panda shrimps.
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post #4 of 10 (permalink) Old 07-18-2018, 08:35 PM
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Quote:
Originally Posted by Devilsur View Post

I was aiming ideal parameters for Taiwan panda shrimps.
Then you don't want any form of carbonates whatsoever. KH should be zero. I've found that they do better with a GH of 4-5 and temperatures below 74 F. Your substrate should buffer pH down to 6.5 or lower easily enough, depending on what you are using. They do well enough with a TDS of 170 ppm or lower. If aiming for ideal levels 100-120 would be better.
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post #5 of 10 (permalink) Old 07-18-2018, 08:50 PM
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Thanks alot for the fast reply mate!

Is my first time doing this so I'm overly paranoid I guess.

I was aiming ideal parameters for Taiwan panda shrimps.
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Originally Posted by madcrafted View Post
Then you don't want any form of carbonates whatsoever. KH should be zero. I've found that they do better with a GH of 4-5 and temperatures below 74 F. Your substrate should buffer pH down to 6.5 or lower easily enough, depending on what you are using. They do well enough with a TDS of 170 ppm or lower. If aiming for ideal levels 100-120 would be better.
Yup, agree with Madcrafted. You need to get yourself a buffering substrate of some sort and not add carbonates to your RODI. You could look at Fluval Stratum, ADA Aquasoil...several others out there that buffer but those are the two that immediately come to mind.
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post #6 of 10 (permalink) Old 07-18-2018, 09:37 PM Thread Starter
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My substrate is inert and I cannot really change it atm.
But I have a big tree trunk in the aquarium that is releasing alot of tannic acid so I need abit of carbonate in order to prevent the possibility of a pH crash. ( Not that 1.5 KH will be such a big buffer, still better than none...)

I guess is better to be safe and slightly above ideal than having a fluctuation in pH and nuke most of my future colony ...
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post #7 of 10 (permalink) Old 07-19-2018, 01:41 PM
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Originally Posted by Devilsur View Post
My substrate is inert and I cannot really change it atm.
But I have a big tree trunk in the aquarium that is releasing alot of tannic acid so I need abit of carbonate in order to prevent the possibility of a pH crash. ( Not that 1.5 KH will be such a big buffer, still better than none...)

I guess is better to be safe and slightly above ideal than having a fluctuation in pH and nuke most of my future colony ...
What is your experience like with shrimp keeping? If you have a lot of experience, you may be alright. Otherwise, I'd suggest looking into Neo's for your current setup.
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post #8 of 10 (permalink) Old 07-19-2018, 03:22 PM Thread Starter
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Why so? I had neos in the past, till I decided to go with caridinas. All went well.
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post #9 of 10 (permalink) Old 07-19-2018, 03:25 PM
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Buffering substrates keep things more stable, which Caridina prefer. If you're experienced with Caridina though in a non-buffered environment, you may be fine
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post #10 of 10 (permalink) Old 07-27-2018, 10:17 PM
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Originally Posted by Devilsur View Post
So, as title suggest I get a high pH ( around 8) after Remineralizing the RO/DI water.

- Ph= 8 (more or less, color based test)
What are you using to measure pH? It sounds a bit vague.
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