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Old 01/15/2017, 04:31 PM   #14
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Join Date: May 2004
Location: Dallas, TX
Posts: 10,903
Found some plots I took while curing. Every time I would turn the skimmer off then on, you can see the rise and then drop in pH.

 photo pH_zpsd3265a77.jpg

 photo pH2_zpse2cb717b.png

 photo pH3_zpsde6af431.png

 photo 0177179D-D9C8-4025-B7E0-C0FE76D9E71B_zpszztfm7uf.jpg

 photo 9E7D29B4-3B1C-4376-8B20-19BE24BF5E49_zpsmd2ppusp.jpg

Unfortunately, I didn't capture the initial pH drop, but I think this shows what I'm talking about. Basically - the water and air will find equilibrium. If my pH is too low, I turn on my skimmer and up it goes. If my pH is too high, I turn on the skimmer and down it goes.

It doesn't matter if this is CO2, carbonate or bicarbonate... it is available and is pulled in from the air.

To keep Alk and Ca, I dose kalkwasser and that also impacts my pH but the primary driver is still CO2 in the air.

 photo 0510C9DE-5878-40CD-9159-865F5D2DBE05_zpssccyq7fs.jpg

Failure isn't an option It's a requirement. 660g 380inwall+280smp/surge S/L/Soft/Maxima/RBTA/Clown/Chromis/Anthias/Tang/Mandarin/Jawfish/Goby/Wrasse/D'back. DIY 12' Skimmer ActuatedSurge ConcreteScape

Last edited by karimwassef; 01/15/2017 at 04:44 PM.
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