is circulation needed

Chemicals to adjust KH should not contain phosphates. Typically one uses NaHCO3, (Sodium Bicarbonate, or Baking Soda), which is free of phosphorous. ½ teaspoon per 100 liters will raise the KH by about 1 degree or 18ppm.
 
wait !?!? there are two threads haha this is the other thread you guys were talking about.. so regarding my reply on the other thread ?
 

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