Fast-acting and long-lasting, Jacks Magic JMMAGENTA640 5 gal The Magenta Stuff™ helps removes stains & scale and protects all pool finishes from staining and scaling. The Magenta Stuff™ is great for start-ups; it helps control plaster dust. Highly effective in all pool sanitizer systems including salt chlorine generators. The Magenta Stuff™ cleans and helps prevent scaling of salt cells, helping to extend cell life, and it also will not yield phosphates.