One radiator still gassing up after power flush

[Merox]

I recently performed a power flush on a gravity fed system with a gloworm boiler. The boiler wouldn't start and BG were called in. The guy from BG fitted a new pump and said that the system should be close-coupled and power flushed at a cost of over£500 so I hired a machine and followed all the instructions and did it myself. In the process of this I discovered that the 15mm supply from the F&E tank was blocked and I cleared it. I added 2 litres of Sentinelx100 to the system which has 8 radiators. The heating worked a treat for the first time in ages. The only problem I have is that the bathroom radiator needs bleeding at least once a week. The gas will burn if I hold a match to it so I suspect from what I've read that it is hydrogen. I've done the steel nail test and my nail has been in a bottle of yellowish liquid from the system for over a week and is still shiny as new. My question is where is all the gas coming from and how do I stop it?

Many thanks

 

[croydoncorgi]

I think it's time the inhibitor suppliers stood behind their products!

If you've got the time, contact Sentinel (Betz Dearborn), tell 'em you've done all the right things (flushing, etc.), then used their inhibitor but it ain't inhibiting because you've still got hydrogen gassing. They may admit that X100 does NOT prevent electrolysis or bacterial action which produces hydrogen. That would be a first! Or they may come up with some constructive suggestions.

You're not the first person to have this problem.

I, for one, would like to know the outcome.