siphonage, leakage, valve, sump pump, soakaway, seepage, drains, downpipe, sewage, chlorination, flue pipe, stopcock, outfall, drainage, overflows, ingression, turbidity, chloramine, potability, underdrain, clarifiers, recirculation, effluent, bilge pump, contaminants, watercourse, leak, sump, inferior vena cava, clarifier, septic tank, contamination, semipermeable membrane, overfill, sewer, mains, underflow, overvoltage, spillway, condenser, immersion heater, pipework, coolant, leachate, diverter, crossflow, earthing, ignition coil, arrester, piping, pumping station, blockage, flooding, filtration, discharges, waterlines, inlet, hypochlorite, eustachian tube, faucets, downspouts, manway, sluices, forebay, downspout, overtopping, intake valve, centrifugal pump, reticulation, weirs, suction, connector, hydrants, emboli, water, diking, rainwater, influent, macerator, zener diode, disinfection, impeller, chlorides, oxidisation, sacrificial anode, orthophosphate, sewerage, groundwater, sullage, pumps, pericardial sac, separator, dislodgement, aeration, aerator, overpressure, coliform, flashings, duct, penstock, disconnecting, upflow, reabsorption, absorption, spillage, inflow, diuresis, filling, shrinkage, warming, extravasation, loss, outflow, recoil, regrowth, retention, vaporization, carryover, clotting, antithrombotic, electrode, needlestick, nontariff, overload, pollution, spill, thermostatic, amplifying, antiarrhythmic, antistatic, apotropaic, arousing, audiovisual, automatic, ballistic, barrier, biomedical

heartburn, pyrosis, regurgitation, right atrioventricular valve, tricuspid valve, ureterorenal reflux, vesicoureteral reflux

flow, flowing

backflowing