Underdrain Nozzles and resin traps solve different problems in ion exchange systems. Nozzles manage flow and support the resin bed inside the vessel, while resin traps act as downstream safeguards by capturing escaped resin beads. Used together, they reduce the risk of resin loss and downstream equipment damage. https://www.johnsonwedgewire.com/news/wedge-wire-resin-trap-vs-underdrain-nozzle.html