PPHC 028 is a Sodium carbonate is the inorganic compound with the formula Na₂CO₃ and its various hydrates. All forms are white, odourless, water-soluble salts that yield alkaline solutions in water.

The decahydrate is formed from water solutions crystallizing in the temperature range −2.1 to +32.0 °C, the heptahydrate in the narrow range 32.0 to 35.4 °C and above this temperature the monohydrate forms. In dry air the decahydrate and heptahydrate lose water to give the monohydrate. Other hydrates have been reported, e.g. with 2.5 units of water per sodium carbonate unit.

Add 0,5 – 1,0 kg/m3 Soda Ash to the make-up water to obtain the following properties:pH 8,5 – 9,5, Total hardness < 100 ppm. Mixing Soda Ash in a fluid with a lower pH and elevated Calcium will immediately increase pH. Keep on mixing the Soda Ash for approx. 10 minutes, allowing the calcium ions to precipitate.



  • Used as a pH regulator to maintain stable alkaline conditions
  • Removing Calcium or Magnesium ions and replacing with sodium ions



Apperance : Solid (Granular)
Odor : Odorless
Colour : White
pH : 11.4