'On the Go' water softening device- orange granules

Despite my best efforts, I hooked up my water softening cylinder backwards. What mostly happened was an overly thorough back flush.

What did damage,I think, was when I opened the top, and had some orange particulate granules overflow the rim, and get lost.

I gather that this is bad, and it deteriorates my devices efficiency. My question; can you get replacement granules?

If so, where?