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Looks the same consistency as Sentinel rapid dose leak sealer.
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Another vote for some sort of leak sealant
Needs to be flushed out!
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Powerflush guy reckoned he couldn't flush it. Any ideas what chemical I can use to break it up?
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I've got some seriously weird crap in my central heating (only been in the place a few weeks so don't know history). It looks like some...
Thanks.
Looks the same consistency as Sentinel rapid dose leak sealer.