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Hi there I have a friend who's 90!! and was world champoin sidecar racer , you may of heard of him -Stan ... anyway he has a solar thermal system with no flo thro the solar circuit... can anyone recommend or do a glycol flush and drain and top up or whatever is required. I have a lot of time for this guy, he's still fit as a flea and if i'm half as spritey at 60 i'd be happy! Any advise welcome :smilewinkgrin: