Originally Posted By: jzmtl
The company that published said PDF wants people to buy backflow valves, which they happen to make/sell. I'd take what's said with a big chunk of salt.

If you lived in, say, Haiti, perhaps substituting "Typhoid Fever" for "salt" would make sense.

Haiti has no codes on building. It's a real issue if US rebuilding grants should require it (since Haiti has no codes there are no inspectors, so compliance is not a minor issue).

There are plenty of areas (and builders) in the US I'd be highly suspicious of: I wonder how often code inspectors actually check to see if backflow prevention is working?