The first thing I'd like to mention is related to problem that I've come across a couple times this week during different laser cutter repairs. It is incredibly important to make sure that your water is in pristine condition. If you're running off of a bucket which I don't particularly recommend make sure that it is a completely closed system. You can do this by getting a 5 gallon Home Depot bucket and using O-rings to seal the tubing that is coming out of the bucket. For the wire there are two options. Cut a small square out of the top of the lip of the bucket. If you do this correctly the bucket should still be able to seal as long as you make the hole as small as possible. For those that are a little bit more technically inclined you could always split the wire and put it through an O-ring.
I will always recommend going with a proper chilling system. We have however developed a cost effective hybrid alternative for those that don't want to go all the way up to an industrial chilling System. The system it comes with is a small chiller and pump which you can hook up to the reservoir of your choice. This system can be used with the aforementioned Home Depot bucket system but removes the need to cut out a section for the sump that normally comes with a laser cutter or laser engraver. This system only requires holes for the tubing which means it can be completely sealed off from the environment.
If you have green, white, or even black debris in your water this is a pretty big issue. The best thing to do is immediately change your water with new water that is filtered. Do not use tap water. The next thing we recommend is to contact us for a bottle of our special bio buster which will help remove any potential blockages you can't see in the system. The other thing you can do is use compressed air and water. This can be very tricky and incredibly dangerous to your laser tube as you can crack it if you do not do this correctly. We do not recommend more than 30 PSI.