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HVAC Waters

     

preventing rusting corrosion
   
If dissolved oxygen is present in a closed loop, oxidation (rusting) of metals occurs. Scavenging (using up) dissolved oxygen prevents rusting corrosion.

sulfite (sodium sulfite)
Dissolved oxygen molecules are withdrawn from solution by this reaction:

dissolved oxygen is depleted as it reacts with sulfite ion and makes sulfate ion 
or 
O2 + 2SO3= becomes 2SO4=

Maintain 20 to 50 ppm sulfite at all times.

 

for your information

log templates

sodium sulfite
94% sodium sulfite, anhydrous (Na2SO3)
100 lb. bag = $185 
Van Waters & Rogers 
800 234-4588

sulfite test kit 
model # K-1529 = $29  
Taylor Technologies
800 638-4776