On Wed, 03 Sep 2003 21:05:05 +0000, Ghazanfar Ghori wrote:

Always keep an eye on pH. Determine your CO2 levels using the pH / KH
chart available on Chuck Gadds website. (works as long as you're not using
any buffers). About 25-30ppm of CO2 should be your target.

How long does your CO2 last before you have to dump it and mix a new batch?