I would like to know ,what is the worst condition you have seen a system in ?. I went to a job were the girl told me "I think the rads are going to burst". I went and found single rads had swelled out to 15" in depth,so it was 17" off the wall,system 4 yr old,i found leaks under the floor,so drawing air in all the time and no chance of inhibator staying in ,it was then pumping over,just a wreck,then i seen her g/worm ultimate h/ex, about to pinhole ,she paid £2.000,4 yr ago and had to pay for a full new sytem