Brine in a solar evaporation unit will not be pumped out. However, it can be manually put into buckets.

If you take those buckets over to another solar evaporation unit, the buckets will not empty into the unit. It seems that, for whatever reason, brine is not properly recognized as a valid liquid.

Because of this, it is currently impossible to do Tier 3 ore processing or create lithium.

I'm using 1.7.10 Minecraft with Mekanism 8.0.2, NEI 1.0.4.83, ttcore 0.1.0-67, Waila 1.5.10, with Plugins 0.0.1-14. Setup is entirely with mekanism mechanical pipe.

Part of this was a real issue, the other half was a derp. See the other bug report.