I know you are all snickering out this since these little bugs are just one step up from toys.....but.....I think I have found the secret to these little buggers...Hayward is right first of all about the hose length and the returns not spraying on the floating hose....BUT....they work great right out of the box and then they rapidly decrease in effectiveness....BECAUSE....after one year the little feet on the bottom which are made of an especially soft plastic wear down and the creature cant get traction and slows down....I REPAIRED the feet by cleaning them with denature alcohol and squirting silicone rubber caulk into the little crease and effective retreading the tires and it works great again...we'll see how long it lasts but it just cleaned my pool in about an hour when just two days ago it worked for 4 or 5 hours and barely did a good job....some yankee ingenuity for you. PS: I just couldnt bear to spend $15 bucks to put new ones on before i tried this.