Contact your fire department. They are a good source of information in many cases. Also your insurance company may have info available or point you in the right direction.
If you get things moving again you should consider an in line strainer to catch that stuff. Still it shouldn't be there. I hope they used cross linked pex under the floor.
If you want to mess with it you could consider hooking up a compressor to the bottom boiler drain and giving it a short shot of air and see if that unclogs it.
That then is a closed loop system using the same water. There should be no sediment at all in that system. I have never seen a geo like that and I don't understand the problem. You may want to consider having the installer or other pro out to evaluate it.
I have always been safety aware. Upon the completion of my garage, I installed the fire extinguisher and a carbon monoxide alarm. I am considering having two extinguishers in the garage now. I have several in my home. In all my life I never had to use one until just now. I thank God that I...
Today I had a propane radiant heater malfunction and burst into flames. Fortunately I had an 8 lb extinguisher hanging on the wall. It was a pretty big fireball and was not sure it would work. I discharged it and it completely put out the fire.
If I did not have that extinguisher I would...