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 | can i guess what's my CO2 level? |
fry  Enthusiast Posts: 243 Kudos: 195 Votes: 3 Registered: 27-Jul-2004   | CO2 should lower pH, unless my water is Kh high, right? so if i know "regular" pH, and Kh, can i calculate what's the maximum of CO2 i could have with this kind of data? if yes, then how to do it? (btw, i think it's a theoretical question. i have Kh of 6 degrees) |
 Posted 26-Jan-2006 11:19 |     |
FRANK       Moderator Posts: 5108 Kudos: 5263 Votes: 1690 Registered: 28-Dec-2002   | Hi, IF you know your current pH AND you know your current KH THEN you can plot them on this chart: http://www.csd.net/~cgadd/aqua/art_plant_co2chart.htm For best plant growth and health, you want to keep your CO2 saturation within the green shaded areas. Frank  -->>> The Confidence of Amateurs, is the Envy of Professionals <<<-- |
| Posted 26-Jan-2006 11:19 | |
| fry Enthusiast Posts: 243 Kudos: 195 Votes: 3 Registered: 27-Jul-2004 | good call, thanks! now a more specific problem: i added DIY CO2, and registered no pH swing at all (my "natural" level is 6.8). Kh is 6deg. what can ruin the calculations? (my guess is i don't have a "natural" 28ppm CO2 in a bucket) |
| Posted 26-Jan-2006 11:19 | |
| FRANK Moderator Posts: 5108 Kudos: 5263 Votes: 1690 Registered: 28-Dec-2002 | Hi Fry, Well the high KH (6) is what is buffering the trend for the water to go more acidic with the addition of the CO2. The normal value for CO2 in water in equlibration with the air is around 5 mg/l. With water in the pH range of the 6's I suspect that you have some excess CO2. If you let the bucket sit, and/or provide some aeration I suspect that the values will change as things even out. In either case, the addition of CO2 can help the plants. Frank -->>> The Confidence of Amateurs, is the Envy of Professionals <<<-- |
| Posted 26-Jan-2006 11:19 | |
| fry Enthusiast Posts: 243 Kudos: 195 Votes: 3 Registered: 27-Jul-2004 | but i had pH of 6.8 without any addition of CO2 into the tank, which means phosphates, i guess. the site clearly indicated that it will change the equation. |
| Posted 26-Jan-2006 11:19 | |
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