Which Cleaner To Use

[minofso]

I have altered my fully pumped, open vented heating system to a sealed one because air was being drawn in down the cold feed pipe. This has led to corrosion and the system is producing hydrogen. I put Sentinel X400 in the system for a couple of days prior to changing and now have X100 in.
I have found that X400 should be in for up to four weeks or until circulation is restored. I have no problem with circulation and no cold spots. When the heating is running at high temperatures all is ok. When the CM67 operates and calls again, the hydrogen is pumped into the first rad from the loft then all is ok again until the next cycle and the same happens again. If the system is allowed to cool by the CM67, no hydrogen is produced.
Would a dose of X400 in for a month be sufficient OR would Sentinel Ferroquest do a better job of cleaning the pipes?

 

[kevplumb]

cm67?

 

[minofso]

CM67 - Honeywell Programmable room stat.

 

[kevplumb]

aaahhh
dont electrics now
thanks for bothering to reply
just made an old man very happy

 

[kevplumb]

electrolytic corrosion

 

[oilman]

Did you cut copper pipes?
Bits of copper swarf got into radiators?
Well, give it a couple of weeks, maybe longer, and you may find some holes in the radiators.

 

[kevplumb]

want to borrow my cleaner shes the dogs
dunno about your rads
she hangs the washing over mine

 

[ChrisR]

Ferroquest is a flushit (that said "flush it" without the gap!) same day product developed for use with power flushers, There are lots of others. Fernox Heavy Duty is better than X400 in that it's faster but not aggressive. Fernox DS40 is good but a mild acid and needs neutralising. Then there's Kamco products which are all ok. See their web site