NIOXIN System 1, 2, 3, 4, 5, or 6 Gallon Duo Set

Nioxin System 1, 2, 3, 4, 5, or 6 Gallon Duo Set Cleanser & scalp therapy conditioner set (Select System Number). Thank you for your order. Unfortunately, System 1, 2, 3, 4, 5, and 6 in gallon sizes are discontinued. However we will gladly replace one-gallon sizes with four one-liter bottles at no extra cost. 3.75 liter = 1.00 gallon 4.00 liter = 1.06 gallon You will be getting a bit more plus the added benefit of easier maintenance in separate bottles. Thank you.