The Pentair Optiflo 1-HP Vertical Discharge Pump is designed to deliver dependable high efficiency flow performance and easy maintenance for above ground pool owners. OptiFlo pumps for aboveground pools feature a revolutionary design that delivers dependable high flow performance. The lid on the large strainer basket is clear so you can see when it needs to be emptied and the cam-and-ramp style allows you to remove the lid with just a quarter of a turn, no tools needed. Like all Pentair Pumps, its efficient and provides long, trouble free life.