I placed the unit in the skimmer or pump basket, and I noticed some blue minerals coming out of it? Is this normal?

Yes. The minerals are packed inside the specially treated alloy cylinder in the PoolRx unit. The minerals are blue-ish in color and start dissolving immediately when placed in water. That is why it’s important to run the pump after install for at least 3-4 hours (longer is even better) so all the minerals can dissolve completely into solution and circulate properly.