Our 1 inch diameter chlorinating tablets for control of algae and bacteria is stabilized and slow dissolving and ideal for floating chlorinators, chlorine feeder systems and other erosion type chlorine feeders. Our tablets are perfect for maintaining proper levels in your pool. Your feeder or floater should be adjusted to maintain a chlorine residual of 1.0 - 1.5 ppm.Ships in 1-1/2 Lbs plastic container with safety cap.