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Re: [APD] phosphates and co2 table

>>>>>Alkalinity, total bases present. Which is why the phosphate compounds muck things up.Only if carbonates are the bases, does the table work out as advertized. 
I'll wager that, for most folks, the table will be more precise than eyeballing the tank. Eyeballing is good for extremes, way too low, way too high, but not so good for fine tuning. Measuring KH and pH will probalby serve one better.  However, if you add bases other than carbonates, or they come from the tap, then you're back to merely eyeballing, which isn't the best way, just the only way if nothing else works.

----- Original Message ----
From: Vaughn Hopkins <hoppycalif at yahoo_com>
To: aquatic plants digest <aquatic-plants at actwin_com>
Sent: Tuesday, March 7, 2006 11:21:44 AM
Subject: Re: [APD] phosphates and co2 table

KH is actually a measurement of alkalinity, not a measurement of 
If the alkalinity  in the water is all carbonates the 
PH/KH/CO2 table works fine, but if not, it doesn't.  There is no easy 
way to measure the carbonates in the water other than KH.  That's why 
the best way to "measure" CO2 is to watch the fish for signs of 
distress, if you are injecting as much CO2 as  you can without 
bothering the fish, that is the right amount.  (In my opinion)
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