kalk + vinegar measurements

I use vinegar/kalk from our 20 gallon ATO and it works great to maintain CA.  Here is an exerpt from Randy Holmes-Farley article which I used as a guide:
How much can be used? The more vinegar that is used, the lower the pH of both the limewater and the aquarium will be. One reasonable point to shoot for is to add about the same amount of total CO2 via the vinegar as is needed by the lime to form HCO3-. This balance is roughly matched by using three level teaspoons of solid lime per gallon of limewater, and 45 ml of vinegar per gallon of limewater. For those aquarists choosing to use vinegar in limewater, these values are a suitable starting point. Note that the pH of the limewater is still quite high, so slow dosing is usually required.
and a link to the article:
http://reefkeeping.com/issues/2005-01/rhf/index.php#7