Safe antifreeze for my ALDE Compact heating

The frost protection has been chosen by me because ALDE aluminum radiators used and because one does not know when the first owner has replaced the old fluid.
And to fill the new cycle, the liquid was constantly swapped in exchange container until then only the new
Antifreeze was present.
But what you have to say, Kaso Tec has the canister well packaged, delivered by GLS and still specially announced the delivery by mail. This is service!
Of course I can not even say for frost protection, but I would order it again!