How to check the metal content of laser cooling water
New to the group, glad to be here but please bear with me. How do you check the metal content of the cooling water for a Laser. I am currently using a pond fountain pump, not a separate chiller and it works well. Reason I am asking is I was in the middle of a job and my laser started arching to the water inlet. I refreshed the water, cleaned the tube best I could and even put more silicon sealant around the area it looked like the arc was coming from (HV line). No luck, same problem. I was told that it was due to too much metals (contaminants) in the water possibly from the pump . I guess I'm looking for a meter of sorts i can place in the water to monitor its purity. If y'all have any ideas please reply. At the point of ordering a new tube and P/S. Not sure how to put up a video but will try. BTW I am using a Chinese 60W Red/Black. Bought brand new 3 years ago and this is the first major problem.
Thanks in advance