Hydro International Limited designs and sells products and solutions for managing water worldwide. The company’s stormwater products include Downstream Defender to remove fine particles, oils, and other floatable debris; First Defense Vortex Separator to remove sediments, litters, and oils; Hydro BioCell, an biofiltration system; Hydro-Brake Chamber that comprises a precast reinforced concrete chamber base; Hydro-Brake flood alleviation for flood prevention; Hydro-Brake Optimum to control the forward flow of water; StormBank systems; Stormbloc for below ground storage/attenuation, surface water infiltration, and soakaway systems; Stormcell Storage, a stormwater storage system; Hydro StormTrain Series, a toolbox for surface water treatment; Up-Flo Filters; Hydro-Brake isolator pollution containment valves; and agile flow controllers. Its wastewater products comprise DynaDisc, a disc filter; DynaSand, a upflow vertical sand filter; DynaSand Deni to remove nitrates; DynaSand Oxy to remove ammonia; Grit Classifier and Grit Cleanse products; Grit King, a hydrodynamic vortex separator; GritCup, a grit washing solution; SpiraSnail, a dewatering screw system; HeadCell, a multiple tray separator; Hydro Vortex Drop shaft systems; Lamella separators to treat sewage and industrial waste streams; Meva screw wash presses, a screenings wash system; Hydro MicroScreen rotating screen belts; filterMeva counter pressure screws; Meva shaftless screw conveyors for conveying sludge screenings and other wet and dry solids; SludgeScreens; TeaCup for headworks grit removal, separation, and washing; and Zickert reciprocating and rotating sludge scrapers. In addition, the company provides Heliscreen, which operates under surcharged conditions; Hydro-Jet Screen, a CSO screening system; Hydro-Static Screen, a non-powered screening technology; and Storm King, a hydrodynamic vortex separator. Hydro International Limited was founded in 1980 and is headquartered in Clevedon, the United Kingdom. As of July 26, 2023, Hydro International Limited operates as a subsidiary of Oldcastle infrastructure, Inc.