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Originally Posted by angmoh
Dom: then you dont need to know how much CO2 contained ? or u just keep on pumping CO2 into the tank ?
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What dom means is that most of the hobbyist only test for pH and kH and according to this CO2 table, you will be able to tell the CO2 content inside the tank by knowing about PH and KH..
You can key in yr pH and kH into this website to get the CO2 content in the tank.
http://www.csd.net/~cgadd/aqua/art_plant_co2chart.htm
I also find that KH value usually stays the same even after 30% weekly water change.