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You can use this page to link to other useful industry references.



Contractor American Society of Testing and Materials (ASTM)
Plumbing and Mechanical  American Society of Heating, Refrigeration, and Air Conditioning Engineers (ASHRAE) 
P&M Engineering American Society of Sanitary Engineers (ASSE)  
Water Conditioning and Purification   Directory of Plumbing Manufacturers
Water Engineering and Management National Sanitation Foundation (NSF)
Water and Waste Water Digest Radiant Panel Association (RPA)  
Water Quality Products Water Quality Association (WQA)