Backwards SH?

[Ray]

One of the issues you may find, over time, is the buildup of minerals on the outside of the pot.

In such a setup, essentially all of the evaporation is on the outer surface of the pot, swampstick, etc. As that happens, any dissolved minerals, whether they be fertilizer or stuff already in the water, will precipitate onto the surface.

The only ways to truly control that is to use pure water inside the pot, and feed via a spray from the outside, then flushing the surface well.