Prodibio Bio Clean - Fresh Water Available in Nano Range 1 vial per product up to 15 gal/15 days; Standard Range 1 vial per product up to 50 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 used 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 temerature Available in Nano Range 1 vial per product up to 15 gal/15 days; Standard Range 1 vial per product up to 50 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 used 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 temerature This product contains 4 nano vials, 2 each of 2 different products. Each vial treats up to 15 gal and should be dosed every 2 weeks. This product treats up to 30 gal total