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Discussion Starter · #1 ·
I've noticed a slight dip in my pH when doing water changes with Marine Labs Reef Crystals.

I tested newly made water after it had been aged a few days, heated, and aerated. I was surprised to find the pH was 7.8 by test kit and 7.87 by pH monitor (newly calibrated)! The dKH was 12 and calcium 500.

I made another batch after buffering 38 gallons of R/O DI water with 3 tsp. of Kent Superbuffer and got a snow storm of pecipitated calcium carbonate.

Has anyone else noticed this?:arg:
 

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TCMAS Member
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Being one who swears by Kalk, I never cared to check what the PH would be of freshly mixed salt.

I suspect that once you have it in the tank with lights going and things respirating that the PH levels would be a non-issue in the freshly mixed salt.
 

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Discussion Starter · #4 ·
rihanssu said:
why do you think thats calcium? super buffer should raise alk not calc
I can't recall the equilibrium equation but the is a balance between calcium and alkalinity levels. When one goes up the other goes down. It seems to be a non-linear relationship.
 

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Caitlin Renee 6/29/07
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3,199 Posts
is this what you are referring to?


Alk/ dKH/ Calcium
0.00 0.00 360
0.50 1.40 370
1.00 2.80 380
1.50 4.20 390
2.00 5.60 400
2.50 7.00 410
3.00 8.40 420 (Near sea water)
3.50 9.80 430
4.00 11.20 440 (goal)
4.50 12.60 450
5.00 14.00 460
5.50 15.40 470
6.00 16.80 480
6.50 18.20 490
7.00 19.60 500
 

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no. but it help, see how high your DkH (alk in a german measurment) can go without precipitation? that shouldn 't start to happen till 620ppm or higher, if it is happening earlier i would question your water source (thats just my chemical educated big headed 2 cents though)
 

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csb123 said:
I've noticed a slight dip in my pH when doing water changes with Marine Labs Reef Crystals.

I tested newly made water after it had been aged a few days, heated, and aerated. I was surprised to find the pH was 7.8 by test kit and 7.87 by pH monitor (newly calibrated)! The dKH was 12 and calcium 500.

I made another batch after buffering 38 gallons of R/O DI water with 3 tsp. of Kent Superbuffer and got a snow storm of pecipitated calcium carbonate.

Has anyone else noticed this?:arg:
What is the PH of your RO water?
 

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Caitlin Renee 6/29/07
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oh well i tried... thought maybe thats the table you were talking about. Alk, Ca, pH, and Mg all related some how. i really dont know for sure, but i know at one point in time i had a before keeping alk, ca, or pH up and someone told me check the Mg and he was right, my Mg reading was low, i dosed Mg and its been fine since
 
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