What would you do if your water co added soda ash? - The Planted Tank Forum
 
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post #1 of 13 (permalink) Old 08-18-2013, 09:50 AM Thread Starter
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What would you do if your water co added soda ash?

Okay so we are not talking about baking soda which is sodium bicarbonate. This is the heavy stuff. Sodium carbonate. My tap water is this after 24 hours sitting out:

Ph 8.9
Kh 2
Gh 2

Its obvious that that the power of carbonate exceeds that of bicarbonate. The water is great at first glance. Low tds of 40.

The problem is this soda ash. I run co2 and get the ph down to 6.7 or so and then it goes back to 8.3 or so in the tank. I think soda ash is throwing off my co2 calculations.

Anyone else with soda treated water?
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post #2 of 13 (permalink) Old 08-18-2013, 02:49 PM
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Start keeping african cichlids

Honestly, this is where I lean back on substrates like ADA aquasoil...they buffer the PH down nicely.
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post #3 of 13 (permalink) Old 08-18-2013, 03:03 PM
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I think your lack of Kh may be letting your Ph bounce all over the place.....But I'm no expert

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post #4 of 13 (permalink) Old 08-18-2013, 03:06 PM
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If your pH creeps up to 8.2 while running CO2, then I would suspect you have something in your tank (limestone rock, shells, etc.) that is dissolving and raising your pH.

Or did you mean it creeps up to 8.2 after you turn off your CO2?
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post #5 of 13 (permalink) Old 08-18-2013, 03:13 PM
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After reading again and researching some more I now feel kinda foolish.
Kh2
ph8.9
Is very strange. Subbed to this thread.

Only bad things happen quickly.
A little allot is better than allot a little.
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post #6 of 13 (permalink) Old 08-18-2013, 04:49 PM Thread Starter
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It's not so strange. Keep in mind that kh is total carbonate hardness. Bicarb has much lesser effect on ph than carbonate.

Okay here are some actual figures from my logs with co2 injection.

Tap water ph if left to sit ~24 hours: 8.9-9.0
pH in tank with co2 at full bore: 6.6
pH of tank water with no co2 for 8 hours: 7.7 (total co2 equilibrium with air)

kH of tank water: 4 kh (buffered up with bicarb)
gh of tank water: 4-5 gh (mineralized with magnesium and a bit more calcium)

The thing that confuses me is why my pH is 7.7 in the tank with no co2. Could the driftwood really bring down the pH that much?

If I aerate a small bucket with tap water and let it sit for 24 hours there's yet a different story. I don't think my tap water coming straight out is in equilibrium with the air. There's no co2 in the water at all. The pH in an agitated bucket is 8.0.

Why must by water be so wacky?

Quote:
Originally Posted by Mark Fisher View Post
If your pH creeps up to 8.2 while running CO2, then I would suspect you have something in your tank (limestone rock, shells, etc.) that is dissolving and raising your pH.

Or did you mean it creeps up to 8.2 after you turn off your CO2?
My pH doesn't creep up with co2. It goes down to 6.6 or 6.7.

Last edited by Darkblade48; 08-19-2013 at 01:38 AM. Reason: Please use the edit function for back to back posts to keep threads cleaner
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post #7 of 13 (permalink) Old 08-18-2013, 04:56 PM
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This is where I get confused. You're wondering why your Ph is LOW while I consider it to still be HIGH.

Kh: 4 in my tanks results in a Ph: 7.2-7.4 No C02

I do not understand why yours comes from the tap so high and tends to stay so high....

What all do you have in the tank as far as substrate, rocks, wood etc etc etc?

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post #8 of 13 (permalink) Old 08-18-2013, 05:01 PM
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Just need to get clear, Are you saying that the ph drops when adding CO2? or it get higher with CO2?
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post #9 of 13 (permalink) Old 08-18-2013, 05:16 PM Thread Starter
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It drops from 7.7 to 6.6
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post #10 of 13 (permalink) Old 08-18-2013, 05:18 PM
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Quote:
Originally Posted by Positron View Post
My pH doesn't creep up with co2. It goes down to 6.6 or 6.7.
With the CO2 running, pH drops during the day. When the CO2 shuts off the pH comes back up.
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post #11 of 13 (permalink) Old 08-18-2013, 05:21 PM
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Then your C02 is working! This is a good thing!
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post #12 of 13 (permalink) Old 08-18-2013, 06:18 PM Thread Starter
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I know that the ph drops with co2 injection. I'm just wondering if anyone else here has soda ash added by their water co.
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post #13 of 13 (permalink) Old 08-18-2013, 06:27 PM
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Yes, it is done when tap water gets to a to an acid or acidity level to low. the water company will add Soda ash to bring up the ph. this is done so water pipes will not rot. I would love it if the water out of the tap was 7.0
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