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non O2 barrier pex restricted in Radient slab with rust from cast iron pumps

pumps have been replaced with stainless and system purged, but one particular loop in the slab is very restricted. ive tried blasting it from both directions with 50psi water, and 90psi air compressor. flow improved a tiny bit, but still too low. how to clear? can i push trhough with fiberglass fish tape?
thanks so much,
scott
thanks so much,
scott
0
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Comments
You can choose to do what you want, but you cannot choose the consequences.
it is not the valves, as i had detached the loop from all other components during this flushing attempt.
has anyone ever used a fiberglass fish tape to push a blockage? i have a fiberglass tape with a small metal eyelet crimped onto the end. i have considered cutting off the eyelet, and smoothing the end, then try to fish down into the loop. im not sure if the tape could bend back and forth through the loops "switchbacks",,?
i know it could be kinked, but i believe it is most likely clogged with rust sediment, as the failed pumps were packed with the orange sludge, and i blew much of it from the loop.
Most of the boiler cleaner are a strong detergent, you may need a more aggressive scale buster type of cleaner to dissolve the build up, if it is metal and minerals.
Most of the chemical providers have both cleaner and scale removers available, Rhomar is another good source of products and info.
Or the loop could have a kink? If it is just one loop that is a real possibility.
And in some cases you need to abandon a completely plugged loop or get by with the limited output it can provide.
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