Prodibio Stronti Plus - Saltwater Avail in Nano Range: 1 vial per product up to 15 gal/15 days; Standard Range: 1 vial per up to 50 gal/15 days; Pro Range: 1 vial up to 500 gal/15 days Long shelf life thanks to single-dose glass vials being packed with argon gas to eliminate oxygen; Bacterial products lie dormant until ready Glass vials are tinted; Active ingredients are protected against UV exposure Concentrated formulas are highly effective and economic Does not require refrigeration; Simply store at room temperature Avail in Nano Range: 1 vial per product up to 15 gal/15 days; Standard Range: 1 vial per up to 50 gal/15 days; Pro Range: 1 vial up to 500 gal/15 days Long shelf life thanks to single-dose glass vials being packed with argon gas to eliminate oxygen; Bacterial products lie dormant until ready Glass vials are tinted; Active ingredients are protected against UV exposure Concentrated formulas are highly effective and economic Does not require refrigeration; Simply store at room temperature This box contains 6 standard vials of Stronti Plus. Each vial treats 30-50 gal and should be dosed every 2 weeks or as needed. This box treats a total of 180 to 300 gal