you don't have to convert, skip the degrees part. Type in your pH, then skip the degrees box, type in your KH reading ppm in the box to the right. Then when you click on the degrees box, your reading of both your co2 concentration and KH reading converted to degrees should show, pretty neat, took me a while to fig. out.
but i'm running 16.6 w/ DIY co2, i have the stuff for a co 2 tank, just can't find a co2 tank that is ridiculously priced, any suggestions?
just a note: most KH test kits give results in "mg/L" - that is the same as ppm.
Yeah I was wondering the same thing. This has been very confusing to me. My test kit also give results in "mg/L" and I don't know how to measure that in ppm. For example my test kit says to add one drop of solution at a time until it turns a certain color and take the number of solution drops added and multiply it by 20 for GH and 10 for KH. My tests resulted in 11 drops of GH solution and 11 drops of KH solution, which I then multiplied.
The chart only goes to 15 KH Can someone please explain this to me? Thanks.
The charts and calculators are not at all worthless. They are very good, but not for determining from the tank water KH and pH what the CO2 concentration is. If you use a drop checker, with distilled water having a known KH in it, the chart and calculator work extremely well. If you read carefully, Chuck Gadd notes in his discussion that the equation is not valid for water that isn't "perfect".