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Old February 13th, 2013 #22
Jimmy Marr
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Quote:
Originally Posted by Leonard Rouse View Post
Well, I did a google search and came up with several instances of a softening system going haywire and causing these problems, including the taste and knocking. Something to do with a ball valve sticking in the brine tank. Or it might be the (air check valve?). Gets screwed up during the (regeneration cycle?).

If this is the case, I'm guessing this may be the cause somehow of the cold line being siphoned back into the hot water tank.

That's why I was hoping Fred's system was installed with a bypass, where he could just cut-out the softening system and see if the problem suddenly corrects itself.
I haven't a clue about softeners except that in the only one I've seen there was a bypass to the kitchen tap so as to avoid the use of softened water in cooking and drinking. If that's the case in this system, an asymptomatic cold tap in the kitchen would point to trouble in softener.