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Antifreeze in Heating Pipes
NC: From the little Googling I did on this, NOT having a backflow preventor is a very serious thing to prevent contaminating the water source. From what I read, if the the supply pressure drops by any amount compared to the heating system's, a backflow condition will arise which effectively siphons out the system contents into the supply (well or city water) and contaminating it. Not good! The info I read put this situation on par with leaving a garden hose connected to a hose bib lying in a cesspool. A drop in pressure will siphon cesspool water back into the system. Therefore a vacuum breaker would be needed to prevent such. (A vacuum breaker will not suffice on the heating system).
So IMHO if the plumber did find the pH was low it could be that the system was diluted from backflowing over the years, not just old and degraded.
As far as what the plumber will do for the $1200...that seems like one of those situations where he opens a valve, walks away for 3 and half hours (and makes money too somewhere else) then takes a half hour to install the valve. But I'm jis' sayin' I don't think this will completely empty the system.
I'd ask him if he going to do the above, or is he going to power purge the system using something other (pump?) than the water supply to fill it.
This might be something you can do yourself.
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Antifreeze in Heating Pipes
I nfogot to mention what Frank did about disposal of the bad stuff. You could be opening Pandora's Box if you let too many know about what you have as far as it could be considered hazardous waste and the cost to dispose of it could be expensive. The plumber may tell you he is going to get "dispose" of it but I have to wonder just how: down the drain or is it going into barrels to be refined or recycled like automotive places do (or is it going back to his house and he dumps it on the ground and charges you "disposal fee"?).
To me this is like letting the government know you have plutonium in your basement and you'd like to know how if you can just flush it down the toilet. DOH!
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Antifreeze in Heating Pipes
I worked in the asbestos field too back in '88 as an inspector and industrial hygienist when the Feds (EPA) were really clamping down on the stuff when it came to removal and management. I hear it has really been relaxed too nowadays for homeowners anyway. As far as disposal of the green stuff, I'd look for a auto service station who recycles it.
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12-31-2006, 16:15 
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