The new Ultra-SelfBailer from UltraTech Intl. Inc., of Jacksonville, Fla., can be connected to almost any outdoor containment system. The unit allows water to passively drain while patented filtering media removes any oil or other hydrocarbons. Large or concentrated spills cause filtering media to expand while completely sealing off the drain. Rugged PVC components can be assembled in a variety of configurations for easy installation on containment berms, spill pallets, containment sumps and similar products.