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Re: CO2 table and phosphate

> From: "Rachel Sandage" <rachelsor at hotmail_com>
> Subject: CO2 table & Phosphate
> Hi all,
> I am using the pH/KH table at 
> http://www.thekrib.com/Plants/CO2/kh-ph-co2-chart.html to determine the 
> level of CO2 in my tank. I notice, though, that it says "The CO2-KH-pH 
> equilibrium should be correct
> unless you are taking extreme measures to adjust pH, such as adding
> lots of phosphate buffers like pH-UP or pH-DOWN or using sulfuric
> acid."

	Sulphuric acid doesn't cause a problem - it's a strong acid
and just destroys KH.  Weak acids make it impossible to _measure_ KH.

> Now I do add some phosphate to my tank - maybe a BB-sized ball of 
> KH2PO4 weekly. Will this change my readings?

	It's the total amount there that matters - if you have a few ppm
or less, it isn't going to cause a problem at KH 5.

Paul Sears        Ottawa, Canada