For cleaning swimming pool walls, steps, floors, and waterline. Cleans even algae. It eliminates skipping when cleaning down pool walls, the tail creates more than 10 times the force against the pool surface. Simply push down with 1 hand, the tail creates more than 10 times the force to clean. The tail flips up during the upstroke then acts like rudder on the downstroke. This action keeps the brush against the wall for positive cleaning. Must purchase handle separately.