Have the wheels with the magnetic wiper lately get not really clean and therefore looked around for a new method. It works really well. Unfortunately, our aquarium has at the top around a narrow glass strip, so I do not get really ran at the top because of the angle. Must then always hold my hand into the water and cross work. This is not as convenient. Could be fix safely with another inclination of the handle or a chamfer. In addition, the handle for larger aquariums is too short. Please purchase I beachten.Wenn abschabe bottom, I have a hand in the water. Our aquarium has a water level of 38 cm. For simple discs but highly recommended.