Yea, finding a decent storage volume that will fit under a crossfire pro table is difficult. Ask me how I know. You aren’t wanting to store potable water in it, but that’s all you’re going to find “new” on the market. I found a guy selling off 30gal white plastic barrels (lids fixed, with 2 threaded ports) that were used for industrial soap for a car wash. It fits on its side, but def not much more room to add any wheels or anything to make it movable.
I added a 50 micron inline filter, and have it gravity draining, and electrical pumping back up through a check valve.
This way, the coolant in the tank is clean, isolated, and kept away from light (because algae), and won’t destroy the pump impeller on the way back to the tank. As an added bonus, it backflushes the filter as a side feature.
I used mostly stainless to avoid as much galvanic as I could, and pipe doped everything with Rectorseal 31631.
