Titan series down-flow automatic backwash systems use permanent filter media of specific size, shape and density to provide continuous solution cleaning and filtration at flow rates from 50-500 gpm. The result is significantly increased product yields with reduced chemical consumption and solution maintenance costs. Microprocessor-controlled units are said to automatically maintain constant design flow without compacting particles onto the media bed. Chambers are lined with PVC or hard rubber, and piping and other system components that handle process solutions are constructed from PVC or CPVC. Excel up-flow automatic permanent-media filtration systems with capacities from 75-200 gpm are also available.