I'm going to attempt some work on my central heating system which will involve partially draining it down, possibly a number of times. I have a small water pump, so in theory I could keep the drained water and pump it back into my system. Then I wouldn't have to worry about replacing the corrosion inhibitor and getting the concentration right. Is there any reason this wouldn't work? One potential problem I can think of is if the corrosion inhibitor degrades when exposed to air, so keeping it in a bucket would be bad for it. I don't know if this is the case. Any thoughts?