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Under Floor Heating Flow Meters Silted Up

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McYoda

Hi,

I have a UFH system with a GSHP. The UFH system has 3 manifolds all with glass flow meters.
The flow meters on the manifold nearest the GSHP are turning brown. The system was installed in mid 2010 and there were signs of brown in the flow meters in 2011 but the flow meters are nearly unreadable (mid 2014). There is a filter in the UFH system on the GSHP return. The other 2 manifolds only have minor staining. When the UFH system was installed Sentinel X500 was added to the water but I am not sure what else.

Is this an issue, what is the cause and what should be done about it if anything?

Thanks for your advice
 
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