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I'm guessing it's not actually the sentinel sealer, just looks like it. It's kind of sticky. When I opened the return filter you could see how it was blocking the mesh, plus mixing with the magnetite to form gelatinous goo. I think this is what has happened where my pipes reduce to microbore and...

Yeah, was hoping someone had come across the problem and had experience of dealing with it. I'd be a bit apprehensive on filling my system with a chemical based purely on advice from Google :)

Powerflush guy reckoned he couldn't flush it. Any ideas what chemical I can use to break it up?

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 form of silicone lubricant. Has anyone seen anything like it? Must have pulled out about 250ml so far. Power flush guy was at a loss as to what it was or how...