<div dir="ltr"><div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><p>Hi Dan,</p><p>We’ve encountered similar clogging issues in the past, particularly with chillers. In one instance, we circulated a vinegar solution through the lines for about a day or two, replacing it a couple of times during the process. This proved effective in clearing the deposits and restoring proper flow.</p><p>That said, I would recommend exercising caution depending on the materials in your system, as prolonged exposure to acidic solutions can impact certain metals and components. It’s great that you’re planning to validate solutions using corrosion coupons—that’s definitely the right approach.</p><p>More recently, after cleaning, we’ve been using OptiShield II to maintain the system, which has worked better for us in preventing buildup.</p><p>I’d be happy to share more details if helpful, and I’d be very interested to see the results of your testing once available.</p><p>
</p><p>Best regards,<br>
Parveen</p></div></div><br><div class="gmail_quote gmail_quote_container"><div dir="ltr" class="gmail_attr">On Tue, Mar 31, 2026 at 9:22 AM Dennis Schweiger <<a href="mailto:schweig@umich.edu">schweig@umich.edu</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div><div class="gmail_default" style="font-family:arial,sans-serif">Dan,</div><div class="gmail_default" style="font-family:arial,sans-serif"><br></div><div class="gmail_default" style="font-family:arial,sans-serif">Here at UofM/LNF we're using this product material (Optishield II) for all of the self contained systems and have had good luck with it.</div><div class="gmail_default" style="font-family:arial,sans-serif"><br></div><div class="gmail_default" style="font-family:arial,sans-serif"><a href="https://shop.optitemp.com/" target="_blank">https://shop.optitemp.com/</a></div><div class="gmail_default" style="font-family:arial,sans-serif"><br></div><div class="gmail_default" style="font-family:arial,sans-serif">Thanks,</div><br clear="all"></div><div><div dir="ltr" class="gmail_signature"><div>Dennis<span class="gmail_default" style="font-family:arial,sans-serif"> Schweiger</span></div><div><span class="gmail_default" style="font-family:arial,sans-serif">University of Michigan/LNF</span></div><div><span class="gmail_default" style="font-family:arial,sans-serif">Facilities</span></div><div> </div><div>734.647.2055 Ofc</div></div></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, Mar 30, 2026 at 7:57 PM Dan P. Woodie <<a href="mailto:daniel.woodie@princeton.edu" target="_blank">daniel.woodie@princeton.edu</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
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Most Excellent Lab Managers, </div>
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I am sure most of you have struggled at one point or another with clogged cooling lines on tools or chillers from either mineral deposits or biological growth. We built a specialized cleaning cart with a tank, pump, and filter that we can connect to a tool
to run a cleaning solution through it. We are looking for suggestions for cleaning solutions that others have found to work well without corroding the materials in the tool too badly. We have purchased some corrosion testing coupons to test these solutions
before putting them into use and hope to share this data with the community once the work is done. </div>
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So, if you have any cleaning solutions you can recommend, please share them so we can include them in the testing. Thanks.</div>
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Dan</div>
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Daniel Woodie </div>
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Director, Micro/Nanofabrication Center, Princeton Materials Institute</div>
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