Welcome! Here are the website rules, as well as some tips for using this forum.
If you've found help here, check back in to let us know how everything worked out.
It's a great way to thank those who helped you.
Solar propylene glycol foaming.
I have a whole house heating system that has three solar panels attached the installer designed the system to be all glycol. My issue is that the glycol is proving very difficult to remove the air from when I purge the system with a charge pump it that the air does not separate easily from the glycol mix and stays in solution. The system has radiant floor for a small part of it and several Buderus radiators for the rest of the home heat. The glycol has good freeze protection now. I have not checked the PH yet but will do that. If it was a small amount of glycol ie the collectors connected to a heat exchanger I would flush and recharge the system with new glycol. However this system will be a challenge to flush all the radiators about fifteen of them and the four zones of radiant floor and the pool HX and DHW tank HX. My goal is to keep the existing glycol if possible.