Aqua Flow System for Glastar Diamond Star & Super Star Glass Grinders No more sponges - this works great. Aqua Flow System. A flow system for grinders, made of proprietary brush bristles attached to a highly rigid polymeric holder. It allows water to flow freely through the bristles, providing continuous water to the grinder bit while simultaneously washing away sludge. Eliminates sludgy sponges. TECHNIGLASS 2004