YouTube for laser troubleshooting

I field a lot of laser questions and recently noticed that there are a decent amount of troubleshooting content on YouTube. I’d say for DIYers not professionals.
Worth noting is a common question I read about loss of power. One video claims it was minerals in tap water causing the beam to wander off course.
Have never experienced that, don’t use tap water, but seems possible and something worth keeping in mind when you choose fluid to cool your laser.
Just curious if anyone found something useful or not on that site?


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