hillywav : wich colour was that, how much biocide did you use, wich biocide did you use, how much water do you have in your system. If using a silver kill coil the colour will not degrade, if you using a liquid biocide and you use say ours did you use more than 2 drops per ltr as this will happen. ect ect.
Staining it down to the amount of dye you use and you tubing.
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