The Alpha skimmer from Megator Corp. removes wastewater scum from aeration tanks. Made of stainless steel, it handles aggressive liquids at varying depths and concentrations. It has a lightweight design with one-man operation, an adjustable intake weir, a tri-float design for stability and a shallow draft that enables it to operate in as little as 12 inches of water. The skimmer can be arranged for gravity flow in new construction. 800/245-6211; www.megator.com.