Very big difference from what the plumbers who came before had installed and the solar system was not working. I'm glad it was something so simple and there is no issue as I initially thought, since it was handled by specialists, damn them. They either only put water and it evaporated, or they deceived us and didn't put anything, we are filled with professionals in this country!

Polypropylene glycol is the correct base that does not harm the human body. While this product is based on ethylene glycol, it is only suitable for cars. If it enters the system, you will experience poisoning