Did you have a look at the first article I posted? BTW Lime, pickling lime, kalkwasser, kalk, and calcium hydroxide are all different names for the same thing. This is what is in the article:
"*  What Is Lime?
    * Where To Get Lime
    * Purity Of Commercial Lime
    * What Is Limewater?
    * How To Dose Limewater
    * Vinegar And Limewater To Reduce pH
    * Vinegar And Limewater To Boost Limewater Potency
    * What Else Is In Limewater Besides Calcium And Alkalinity? Metallic Impurities
    * What Else Is In Limewater Besides Calcium And Hydroxide? Mg++ and Sr++
    * What Gets Left Behind On The Bottom Of The Limewater Container?
    * Does Limewater Degrade Over Time? The Degradation Reaction
    * What Else Does Limewater Do In An Aquarium? Raise pH Whether You Want It To Or Not
    * What Else Does Limewater Do In An Aquarium? Raise pH When You Need It
    * What Else Does Limewater Do In An Aquarium? Reduce Magnesium
    * What Else Does Limewater Do In An Aquarium? Reduce Phosphate
    * Limitations To Limewater: Limits To The Addition Of Calcium And Alkalinity
    * Dosing Other Additives in Limewater
    * Lime Safety
    * Summary"
http://reefkeeping.com/issues/2005-01/rhf/index.php