I'm also excited for mine to arrive. I was recently reading about a competing product and there was a reference made that the waste water could be safely added back to the system without any ill effects. I was thinking about this because there has been some discussion about how to handle the water in the tubing, if the Director is say a few feet away from the sump/tank. That will be the case for me and I'm concerned about the water removal from the system, and how I will need to balance this with my auto water change system and ATO. If the tested water is actually ok to send back into the system, then that would make it easier to flush out the tubing before testing (thereby ensuring fresh tank water is being tested) and allow for a mini closed loop that shouldn't affect ATO or AWC. Anyone have any insight into whether this is a good idea (or not) and even possible regarding flushing out the tubing prior to testing?