We're on the verge of moving our shop and running coolant to each machine was high on the list of things to do. We checked with qualichem and our coolant shouldn't attack the pex plumbing but someone had suggested the coolant in the lines might go bad in between top off's. Seems plausible since it's just sitting there not getting circulated. Plan B is to run straight water to each machine, which would be a big improvement over where we're at now. Plus side to this is we could run water all around the shop from one line and not need a second line for just coolant. But I figured someone has been through this so thought I would ask. Also looking for a coolant mixer if you have any recommendations.