PROFESSIONAL GRADE: Heavy duty weighted floating spa, hot tub and small pool chlorine and bromine chemical dispenser. Holds 1" chlorine or bromine tablets. Includes tie string. 13 CONTROL SETTINGS: The 13 adjustable chemical flow control settings make it easy to set the dispenser for worry-free balanced chemical delivery. LONGER TIME BEWTEEN REFILLS: Fill it completely, so you can set it and almost forget it. Just a simple turns adjusts it for more chemical delivery. Great for cold winter water, as it can last for months. FLAT TOP WEIGHTED DISPENSER: The dispensers flat top allows it to lay flat under solar covers, and the weighted screw on bottom cap prevents dispenser from getting caught in the spa or hot tub filter. ONE YEAR - 100% SATISFACTION GUARANTEE: Buy with confidence, if you're not satisfied with this item at anytime within one year of purchase, we'll provide a refund or replacement.