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Thread: Boiler Sludge

  1. #1
    DIY Junior Member
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    Default Boiler Sludge

    I have a sixty year old cast iron, in floor radiant heating system that developed sludge starting last December. The screens on the mixing valve clog up every few days with a gray sludge that is the consistency of peanut butter. It is worse on the boiler side than the return side but both of them clog up eventually. Could this be caused by a sealant that was added (not sure anything was) and if so, what can be done to clean out the system. The water looks clear and there isn't any sign of rust.

  2. #2
    In the Trades Wally Hays's Avatar
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    You should be looking into a totally new heating system ASAP. Sixty years on a copper in slab radiant job is pretty amazing but I suspect that what you are getting is mud in the system from a tubing leak.
    Perception is 3/4 of reality

  3. #3
    DIY Junior Member blazer45's Avatar
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    Sludge build up can be easily avoided by ensuring your central heating system is properly cleaned and maintained using the correct chemical treatments. These can be injected into a radiator or your system can be 'flushed through' by a professional plumber. It's worth the small investment - a new system can be up to 6% less efficient within a matter of weeks if it hasn't been treated correctly, which impacts not only on CO2 emissions and the environment but on household fuel bills as well.

  4. #4
    DIY Junior Member blazer45's Avatar
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    Sludge build up can be easily avoided by ensuring your central heating system is properly cleaned and maintained using the correct chemical treatments. These can be injected into a radiator or your system can be 'flushed through' by a professional plumber. It's worth the small investment - a new system can be up to 6% less efficient within a matter of weeks if it hasn't been treated correctly, which impacts not only on CO2 emissions and the environment but on household fuel bills as well.

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