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​Günter Conrad
Product Expert
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calcite gravel reaction vessel

Using calcite gravel, the pH value is regulated, hydrochloric acid is bonded to the calcium carbonate, and the acid capacity is stabilized.

By means of the calcite gravel reaction vessel, the hydrochloric acid that results from introducing chlorine gas into water is neutralized. As the calcite gravel dissolves, there is a formation of hydrogen carbonates and therefore an increase in acid capacity. The natural solubility of calcite gravel in water is very low. Only so much calcite gravel can be dissolved in respect to how much hydrochloric acid from the chlorine solution is added. In this way, the process is regulated automatically. The calcite gravel reaction vessel is additionally installed into the chlorine solution line between chlorine gas injector and point of application.



  • Treatment of pool water

 Benefits / Features

  • Stable acid capacity by using a natural raw material, reducing the amount of ready-made solutions in the pool water
  •  Partial or complete substitution of the use of sodium hydroxide
  • Good flocculation results due to stable acid capacity No additional metering units necessary
  • Economical thanks to the inexpensive raw material
  • Two vessel sizes available and therefore suitable for all swimming pool filter systems
  • High level of safety by means of pressure relief valve according to pressure equipment directive 97/23/EG
  • Natural process for the neutralization of acid
  • Robust construction calcite gravel reaction vessel