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What’s a RapidTest stick?

This one-minute test determines whether any damaging magnetite (black sludge) is present in a hydronic system. Magnetite is a result of oxidation inside an untreated hydronic system and causes reduced system efficiencies and component failure. 


  1. Take a small sample of system water (in a bucket for example) 
  2. Dip and swirl the stick in the water sample for roughly 10 seconds  
  3. Remove and check the colour of the stick.  
  4. Follow the recommendations below: 

BLACK/GREY: This is indicative of existing corrosion 

ORANGE/BROWN: This is indicative of active corrosion 

Please see ADEY’s Best Practice® blog HERE for steps on how to retore/treat systems.
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