I've been bleeding the radiators to get the central heating up and ready for the winter (sundial Y sealed system). I usually pressure up to 1.5/2 bars and go round all the rads (with system off). The pressure usually drops to 1 bar by the time I'm finished or I just let out some more until it's correct. This time, the pressure hardly dropped?? I have a toilet in the process of being renovated and the radiator's off, so I got a bucket and let out a bucket full. I was really surprised to see the water a milky shade of white and fizzing in the bucket a surprising amount. The only thing I can think of is during the spring, I added a flushing cleaner and inhibitor, but I flushed the system thoroughly (or at least I thought I did). Should I flush again or is this the inhibitor in the system?? Never noticed it before and been here 20 years.
