leaking radiators

Hi there, I was having some problems with my central heating system a couple of months back. One radiator started leaking and I got this replaced and then about a month later none of the radiators were heating up. I got a few people in and they all said I needed a power flush and the system was...

We have quite a large combi boiler central heating system 15 radiators (13 large cast iron rads) and one of the radiators we've just had refurbished (blasted & powdercoated) has a number of pin hole leaks. The leaks aren't sufficient that its dripping but in operation we're getting tiny black...