The Sensor Brush Wash comes in tablet form. The tablets dissolve in water to create a unique wash. These tablets are pH buffered to avoid extreme acidity or alkalinity so as to not affect the existing charges on the brush while safely cleaning any residual debris. These tablets were specifically formulated to be used in conjunction with any brush with SCF technology, whether it is the Arctic Butterfly or any Sensor Brushes. Bottle includes 10 biodegradable tablets.