Musty taste in beer lines

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Bobcatbrewing42

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I have a "Tru" kegerator with 3 corny kegs. The tower has two taps and I have line with a perlick on the third. The beer lines are all inside and kept chilled. Every time that I pour a beer after more than two hours have passed the first couple of ounces taste stale and musty and need to be dumped. If you pour off a little then it is fine but if you just fill the glass, the whole glass has a bit of off-flavor. Of course it is more noticeable in a light pale, than an IPA or porter.
Does anyone have a good method to completely clean out the lines and taps without dis-assembly? Does PBW work or use something stronger?
 

grainbill

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back flush the lines, BeerLineCleaner works well, PBW if you have a way to recirculate through the lines..
 

zachattack

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If the problem persists you can try a barrier tubing like Accuflex.
 
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