I got it to refill liquid in my solar system and I should note that it is one of the few products that contain propylene glycol as an ingredient, so it is not toxic and deadly in case of leakage into the network and consumption of it. The only thing I regret is that I bought 5 liters instead of one liter since I only needed 250ml because one liter I made (75% water 25% antifreeze). This ratio, based on a chart I found, withstands up to -10 degrees and since I live in Athens, something lower than that will be extremely rare. For your information, the 50 50 ratio reaches -20 for rural areas. I was impressed that despite the dilution of 1 to 4, the color of the liquid remained a vivid blue like the original, without being an expert and knowing what that means, but in general, it won me over as a product and its quality from the packaging to the liquid itself.

Excellent quality liquid for the solar panel. It raises the water temperature faster and more efficiently!!!

I use it in my solar panel. It seems good to me. I don't have experience with any other coolant fluid to be able to compare. Everything is okay so far

With ease, you can change the solar fluid for better performance and efficiency. First, dilute it in water, then stir, and finally fill the solar tank.

For use in solar panels, it's okay.
However, when I installed it in heating systems, after a year, leaks started in all the pipes.

German Quality, top coolant for closed circuits, I have been using it for years in solar water heaters. Top choice for closed circuit solar water heaters!