A correctly set uo CH system shouldn't accumulate any real quantities of
gas over time. So you shouldn't need these. Seems to be they are a
solution which treats symptoms, not cause.
If you have lots of gas in your system it's either hydrogen, generated
as your iron/steel components corrode, or air, sucked in somewhere.
If hydrogen, then you need to stop the corrosion soon. If air, then you
need to stop it being sucked in.
Reading your other post I think it's unlikely you have massive corrosion
in your system. if you did, the water wouldn't be clear. So I'm guessing
air is being sucked in somewhere.
there's a simple test to see whether it's hydogen. Collect some of the gas
in an upturned container, introduce a lighted splint, there should be a
That would at least show whether the requirement to bleed the rads
continually is a result of corrosion or whether it's air being sucked in
If you're continually getting air (assuming it is just air) in the
system, then you really need to find where it's getting in / where
you're losing water.
The above will just mask a problem which needs addressing.
Put another way - air getting in means that you are losing water which I
assume contains inhibitor which is getting progressively diluted as a
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