Well In addition to my previous question I am quoting this one from the Red Sea Carbon Dioxide test lab. "Carbonate hardness (KH), Is yet another factor that effects the concentration of CO2. Hard water with a high KH can hold more CO2 than soft water. While it is essentially true that hard water with low PH holds the largest amount of CO2 In practice we can only use the values most suitable for plants, which are PH 6.4-7.2d KH. Do they have a point here ??? Amit --- StripMime Report -- processed MIME parts --- multipart/alternative text/plain (text body -- kept) text/html --- ------------------ To unsubscribe from this list, please send mail to majordomo@thekrib.com with "Unsubscribe aga-member" in the body of the message. Archives of this list can be found at http://lists.thekrib.com/aga-member/