Should be able to as long as the mechanics are still sound.
You'll want to soak everything in vinegar for a while until the mineral deposits are dissolved, may take a few hours to a day or two. Rinse with water.
CLR works well if it's available in your area. This stuff is quite toxic so you'll want to rinse very well afterwards. I usually wash with liquid dish soap after using it, then soak objects in clean water for half an hour or so before letting things dry.
Probably doesn't need saying, however, replace the filter wheels and filter pads, you might be able to clean and reuse the refillable media container.