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  1. Marvin
    My neighbour has a bungalow with a feed and expansion (F&E) tank at the top of his loft. It was completely cleaned out a few month ago (it had black gunge in it). About 2 months later the overflow started dripping. On inspecting the tank it was "mould growth" that stopped the ball valve from working. I think this time it was white mould but I will check with him. What is causing the mould? How can it be stopped? Details: Typical vented central heating system with radiators and oil boiler. Hot water pump, 3 port valve and hot water tank (HWT) in loft! Water treated with inhibitor Standard size F&E tank. Don't think the tank has a proper lid but it does have minimum insulation. My guesses: Pump pumping so hard that water running out of expansion pipe and going down feed pipe causing the tank to become a Radiator. Inadequately vented loft causing a breeding ground for growth and suitable warmth for growth. Feed pipe installed causing heat to rises into F&E tank Port valve, and pump (and HWT which has no where else to go in the bungalow) shouldn't be in the loft. (I would never put a HWT in a loft!) Has anyone come across this before, and if so what did you do?
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