RE: [APD] PH and CO2 Questions

["Ruddy Douglass" <ruddy at maine_rr.com>]

I believe in order for the "charts" to be accurate you must only use
additional CO2 to force the PH down, Introducing another method to modify
the PH will invalidate the chart values altogether.

You need more CO2 or, perhaps, a reaction chamber of some sort to dissolve
more the of the CO2 into the water column.

-ruddy
-----Original Message-----
From: aquatic-plants-bounces at actwin_com
[mailto:aquatic-plants-bounces at actwin_com]On Behalf Of rockel
Sent: Monday, December 01, 2003 6:16 PM
To: aquatic-plants at actwin_com
Subject: [APD] PH and CO2 Questions

I am going to try the "Barr Method" and have all the nutrients in place.
Howerver, my CO2 (DIY) appears to be my limiting factor.
GH = 110 mg/l
KH =  70 mg/l
PH = 7.4-7.5  (City water analysis - test kit also measures 7.4)

Using PH and KH chart my CO2 is approx. 5ppm. From the charts I would
have to get a PH of 7.0 to get 12ppm.
I have some PH Down by Aquarium Pharmaceuticals.

1. Is there any problems using this product?
2. If I  lower the PH to 7.0, (is this low enough), will it stay around
7.0 until the next water change or will it vary up or down (other than
the morning and evening readings)?
3. With a 50% weekly water change using PH 7.4 tap water, will the
resulting tank PH be 7.2 requiring only a 0.2 PH adjustment to get back
to 7.0?

Thanks for your advice.
Dale

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