water storage tanks wastewater tanks powder epoxy tanks WATER STORAGE TANKS We manufacturer water storage tanks to your specific requirements. olumbian TecTank™ produces tanks suitable for all stages of water treatment, including mixing tanks, flocculation tanks, sedimentation tanks and others. Our factory-baked liquid immersion coating system provides the best long-term corrosion protection. Columbian TecTank™ is the leading manufacturer of water storage tanks for fire protection.