Chlorine-Free Sun Shock Water Purifier

Straight from their website under the Product Description tab.
Note: While Chemical-Free Sun Shock is extremely effective in killing algae and keeping your pool crystal clear, we recommend using a small (2 to 3 parts per million) of sanitizer to keep your pool microbe-free.

2-3 ppm FC is pretty typical daily consumption for a pool without this miracle device. So where's the savings?
 
They mentioned that the unit attracts "Calcium" I am on a water well, and I do have a water softener (house), but would not even try to fill my pool with softened water.
Does this unit attract calcium like they state it will..??
Because this is a hassle (see photo) glass beading.
I also have a "Nature2 Express Mineral Cartridge" which seems to be a gimmick, should I abandon the Nature2 Express Mineral Cartridge if I use a "Sun Shock"
 
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