My experience is that filling with the LEAKSHIELD is more convenient and faster because you don't have to keep starting and shutting down the computer, furthermore serious leaks would show up immediately as the vacuum builds up.
However, you also have to be careful because the LEAKSHIELD will suck water until the reservoir is full and the water reaches the membrane of the LEAKSHIELD, you don't want that, so you always have to interrupt the process beforehand and start the computer to vent the loop.
If the fill port is located at the very bottom of the system, however, this will only be necessary once or twice at the most, in contrast to the classic method.
In my case with four 420 radiators and a 500 ml reservoir, I had to start the computer exactly once, then I refilled the small remainder during operation.
Emptying the circuit with the LEAKSHIELD also works, there is extra
this attachment for beverage bottles , but these must be quite stable, otherwise the vacuum pulls the bottle together instead of the water from the computer.
I ordered the attachment immediately when it came out, but have not used it so far, because my loop is very good to empty and I'm too lazy to remove my LEAKSHIELD for it
Translated with
www.DeepL.com/Translator (free version)