This is one of the best things I have ever gotten for my pool. I toss it in, and I can go about other tasks or just sit by the pool while it works. When the program is complete it surfaces and send a message via the app to my phone. Bottom, sides, waterline, surface. I pull the unit, clean the filters (I got a soft brush to help clean the fine mesh), and place it back on the charger. Easy, peazy, lemon squeezy. No debris, no algae line, no sediment. I hope it has a long, happy life. I call mine Borg Queen.