Please contact our support team via
www.mayhems.net. We will replace your tubing and coolant free of charge with our own tubing that has not shown any issues and is not based on PVC which is susceptible to leaching. We will also include the new support kit with the replacement coolants and tubing which is basically a full blitz cleaning system.
When you contact our support team please include a link to here so they can make a record of it.
As for the build up i can confirm that the coolant is doing its job as it is picking up any residue and holding it in the fluid as it is supported to do. This is then being caught up in the fin array. The coolant is doing what it is support to do and that is suspend any crap in the system ready for a flush out which needs doing with regular maintenance.
Please remember Mayhems honors its warranty no matter what and never blame any one for any mistakes a user or manufacturer makes. If its our fault will will do our best to copy any issues and then resolve the issues (if we can). Please use our support team to your full advantage, that is what they are there for

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**D1craig Pastel Ice white is a different product and doesn't contain the same chemicals as XT1. X1, Pastel are different from XT1.
Mick