When it comes to using a Mag Float, the side that should be placed in the water is always the white one. The black side of the float is designed to remain above water and will not float properly if submerged. It's important to make sure you're using your Mag Float correctly as incorrect use may cause damage or injury. When placing your Mag Float in the water, always ensure that only the white side goes into contact with the water and never submerge either end completely underwater. Not doing so could result in problems such as spilling any debris that has been collected from your pool or spa onto surrounding surfaces which could cause additional cleaning or even damage. Furthermore, never use a floating device near an electrical outlet as this can create a potential hazard for yourself and those around you. For best results, when using a Mag Float, make sure you are following all safety guidelines and instructions provided by its manufacturer before beginning any cleaning tasks on your pool or spa area.