From: poutnik4REMOVEnntp@CAPITALSgmail.com   
      
   Oumati Asami  Wrote in message:   
   > I do not know the volume of the pool, its PH or hardness.   
      
   How do you then determine the needed amount of the stuff ?   
      
   The rough estimation of volume   
   can be calculated from the basin shape, size and depth.   
      
   If the ppt only occurs above a threshold, it explains why more   
    hypochlorite causes the ppt. I just wonder where the carbonate   
    came from.   
      
   Water usually contain some amount of soluble calcium bicarbonate.   
   By alkalization, removing extra CO2 or heating, it can precipitate   
    as calcium carbonate.   
      
   Some amount of calcium carbonate is already present in the powder,   
    if it is in contact with air.   
      
      
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   Libor Striz aka Poutnik ( a pilgrim/wanderer/wayfarer)   
      
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