Patented Worldwide. The System 4000™ with Pure Flo Technology is a self-contained cleaning system featuring a user controlled pump and a removable catch basin. The first cleaning system that pumps fresh cleaning solution into the pad every time while containing the contaminated water separately. Easy and effective to use for most types of pads and polishers with easy access to clean pads on the go. This environmentally friendly, water-saving unit is perfect for applications where cleaner pads with less contamination are essential.