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Low Pressure Water Boiler Cleaning

Omega Member Posts: 4
I'm repairing/restoring a 50 year young residential oil fired boiler.  There is quite a bit of sediment, mineral deposits, sludge on the waterside.  It's a cast iron, vertical tube single pass heat exchanger.  I was planning to pump in TSP in solution, then  heat and soak in overnight.  The commercially available cleaners are just a bit too gentle.  Any thoughts?  Thankx.
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