Recirculating Filtration System is a complete water re-use filtering system, is suitable for fresh and saltwater and is designed for moderately sized fish holding systems and exhibits. This complete system combines mechanical filtering, bio-filtration, protein skimming, and UV disinfection, all of which are necessary to sustain a long-term healthy aquatic environment. A unique advantage of this system is the independently sump operated filter components, which increase performance and reliability. Water is thoroughly filtered, then disinfected prior to returning to the tank(s). Benefits include: water saving micron-specific mechanical filtering (no wasted water from backwashing), industrial grade bio-filtration requiring little maintenance, re-oxygenating clarification via protein skimming and protective UV disinfection.