The Performance Valve allows water to continuously erode only the bottom layer of chemical. When a small area of chemical is eroded, you can maintain output much easier than when an entire chemical supply gets wet (like in soaker feeders). Perform-Max™ Feeders can be used with chlorine or bromine - pucks, tablets or sticks - holding from 7 to 10 pounds of chemical. With 3 models to choose from, ther is a Perform-Max™ for you whether your pool is 10,000 or 50,000 gallons.