Filtration & Pumping Commercial Limited

+64 6 358 1933


fpc c02 system

The only real side effect of using Sodium Hypochlortite in a swimming pool as the method of primary sanitation is the continual rise in pH.  As with Gaseous Chlorine, the pH rises.


As Sodium Hypochlorite has a pH over 8.5, it has the effect of raising pH gradually.  To counter this and to maintain safe effective water with teh pH at around 7.4, you must add an acid.  With Gaseous Chlorine the pH lowers so a continuous addition of Alkali is required.  For this we use Caustic Soda (Sodium Hydroxide) or Soda Ash (Sodium Carbonate) in solution.


Acids come in many forms from liquid Hydrochloric and Sulphuric Acid to gaseous CO2.  FPC Ltd manufacture automatic CO2 injection systems for this purpose. 


We also offer diaphragm and peristaltic dosing pumps for liquid acid and alkali addition.



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