I've got a liquid cooled spindle, and I've used distilled water and white vinegar trying to keep it from creating mold. However it's starting to grow a white or very pale looking algee. I've thought about adding maybe bleach, chlorine, or alcohol to the mix, but I'm afraid of what it may do tot he submersable pump and tubes, as well as the interior of the spindle...

Any thoughts form someone that may know of a good solution? What is everyone else using for their cooling fluid? This is a closed circuit. It's not a cutting fluid. Only a cooling fluid for the spindle of my cnc router.

Thanks for any input you can share.

Todd