Mold growth on test fixture

[quizzical1]

Water changes from ~60F to 150 F every 5 minutes. After a month of cycling between hot and cold, the rig was disassembled and this growth was found. Manifold is Aluminum (2024, not anodized) and the device is 303 SS. Manifold images show before and after cleaning - a wire brush and CLR Mold/Mildew foam was applied multiple times, but its been difficult to remove.


can someone identify the growth, and share insights for cause and prevention ?

thank you,

 

[IRstuff]

Looks more like some sort lime deposit as you might find with hard water. Heating the water makes it worse.

https://itlandes.com/hard-water-kil...umber,scaly deposits around heating elements.

If that fits the bill, then water softening. See if CLR will remove the deposits. BTW, the last photo reminds me of my kidney stones from a while back, ugh.

PPS. BTW, mold is organic and soft.

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[1503-44]

Organic cleaners tend to be high PH.
Try cleaning with a more acidic solution.

--Einstein gave the same test to students every year. When asked why he would do something like that, "Because the answers had changed."