Hi, I am a very well trained but fairly inexperienced geo installer. I have installed 14 systems over the last four years with no service calls yet. These have all been horizontals and I used methanol the freeze protection. Purged my first vertical today using one of the state approved substances called Procool (ethanol product) manufactured by Interstate Chemical. My distributor told me that I had to add a jug of inhibitor to this mixture manufactured by Interstate Chemical as well. As I added the inhibitor to the mix I noticed suds immediately form in my purge cart (probably two or three inches of froth on the top while the cart purged). I purged the crap out of the system or at least tried to for eight hours while I worked on wiring etc. I always check to make sure that a system is properly purged by shutting the return valve to my purge tank. In every system I have purged the level of the water has not receded in my purge tank at the end of the purging. I purged this system longer than any and when I shut this return valve the water in my tank sank 16 inches. I know this would mean that there was air in my loop or in my case probably the foam or suds I was seeing in my cart. I am going to evacuate the system on monday and reintroduce fluids, but what is going on here. A reaction with a third chemical? Thanks

If I were you, I'd call Interstate Chemical on Monday. You might even send them an e-mail over the weekend so they would have it first thing to think about.

I plan on it... the curiosity was just killing me in the meantime.

I guess I was just just wondering what kind of chemical might have reacted with my antifreeze and or inhibitor (Procool). I have been using the same water supply for all my loops. Guess I am looking for a chemist?

this is a new one for me. Let us know what you find out.

what kind of chemical might have reacted with my antifreeze and or inhibitor (Procool)

The name "Procool" implies a balanced (engineered) system including corrosion inhibitors, stabilizers, anti-foam agents, etc. "Inhibitors" are of different varieties. What was the inhibitor you added?