From: ouasami@do-not-send.com   
      
   On 11/11/18 22:34, Libor Striz wrote:   
   > 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.   
   >   
   >   
   The shape of my pool is similar to what's on the Korean's flag, the   
   yin-yang, only half of it, of course, and the tail is cut off. I have   
   searched the net trying to figure out how to calculate the volume of   
   such a pool but couldn't find it.   
      
   I just arbitrarily add some amount of hypochlorite to the pool. Only one   
   person uses the pool occasionally. I figure as long as I keep the mold   
   from growing, it's OK.   
      
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