I purchased this off Amazon couple weeks ago to assist with fixing reagents when testing my tanks. Works great and I feel like my tests have had less deviations then previously when I just do the mixing. I also used it to mix my two part from esv. Anyone that has used esv two part knows the alkalinity comes filled 1/4 of the way and it’s solid as a rock. I filled up most of the jug, used the largest mixing bar and within a few minutes thoroughly mixed. Before hand mixing that stuff stunk! I know there is a few mixers out there for single vials but I was looking for something a little bigger to help with two part. Figured I would share