Heat Pipe Manufacturer How Do You Clear Blocked Underfloor Heating Pipes?

How do you clear blocked underfloor heating pipes? - heat pipe manufacturer

I have a 1988 liquid (water) underfloor heating in a conventional oil boiler. The system's main branch of the collector 6 in each arm by a parallel network of pipes in a section of the floor plan of the house fed. The manufacturer compared to "Heating" section under the floor. Now I see that it goes completely waste-water (or almost all) through the point of least resistance, so this allows the sediments accumulate in the "coolest sections under the floor. The last time it happened when we speak of a Rayburn solid fuel oil boiler was we managed to eliminate most (if not all) sections by feeding the circuit with a low solvent - liquid manure for several weeks, then filled with a solution of prevention. This is about 6 years and has been good. This work was done by "someone who knows everything" and now Stystem is blocked because the system and not by a lot of work with the prevention .????