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I bought a no name chinese DVR based on the high spec and the assumption all D1 25fps/ channel recordings would be roughly the same regardless of machine. The DVR has plenty of features and works well except for the fact that the recordings are so poor that they look as though someone has...

My old non condensing Biasi and rads where mains flushed and run for a month with X400 in system, then mains flushed 1 rad at a time in both directions just before the boiler was changed for a new condensing job. After fitting the new boiler the system was again flushed and X400 added. I was...