I tried exactly once to evaluate how useful MgO would be for decarbing under 100C so I could avoid switching the roto bath to oil for decarb. I didn’t design or execute the experiment well and it’s one of my biggest regrets in the last 12 months lol. I wish I had learned @cdpchem’s bromocresol green trick at the time for sure: Tricks of the trade - #655 by CdpIchem
I did discover through substantial experimentation since then that eliminating any oxygen and sealing the decarb environment is very effective for not reacting terpenes during decarb into oxides and such, probably more so than lowering decarb temp by 20 degrees. I would still like to add a catalyst to the equation to further preserve the profile without needing to separate the volatiles from the cannabinoids, especially since I like concentrates with high minors concentrations.
All that being said, I’m not sure I understand the application for getting “water clear” other than maybe to neutralize the micelle to prevent the red oxidation/reaction that seems to happen. Should also note I avoid distillation like the plague so maybe not a good authority here