I have a mobile wet abrasive blaster. I use crushed recycled bottle glass in a 40/70 fine. It looks like sand but doesn't have the silica to worry about breathing. Does great on frames and really great on sheet metal. Oh, and it's about $10 for a 50lb bag

But worry about breathing it anyway.
The seller's website you link is giving misleading, false and misinformed info. I.E.
"It is non-hazardous, non-toxic...."OSHA says: (excerpts)
Health Hazards
Abrasive blasting operations can create high levels of dust and noise. Abrasive material and the surface being blasted may contain toxic materials (e.g., lead paint, silica) that are hazardous to workers.
• Silica sand (crystalline) can cause silicosis, lung cancer, and breathing problems in exposed workers.
• Coal slag and garnet sand may cause lung damage similar to silica sand (based on preliminary animal testing).
• Copper slag, nickel slag,
and glass (crushed or beads) also have the potential to cause lung damage.• Steel grit and shot have less potential to cause lung damage.
• Slags can contain trace amounts of toxic metals such as arsenic, beryllium, and cadmium.
Alternative, less toxic blasting materials include:
• Dry ice
• Plastic bead media
• Sponge
• Sodium bicarbonate (baking soda)
• Ground walnut shells, ground corn cob and other biodegradable materials
• High pressure water
OSHA Document:
DSG FS-3697 11/2013 (5 mo's ago)
Google it