Do not immediately operate the new spray wand under normal pressure. Manufacturing lines, packaging, and household copper pipe cuts all shed tiny particles of debris. If you turn on the water with the spray head attached, those fragments rush into the delicate flow restrictors and check valves, clogging the internal diaphragms.
Unthread the spray head completely from the hose. Place the bare hose end in a tall bucket or hold it firmly down toward the drain. Open both wall stops fully. Move the faucet handle to full cold for 30 seconds, then push across to full hot for an equivalent window. This purges air pockets, dislodges trapped copper scale, and flushes flux residues out of the line.
Inspect every under-sink connection while the line runs at full volume. Use a dry paper towel to wipe the compression fittings, the hose quick-connect, and the shut-off valve packing nuts; drops of water show up instantly on paper. Once verified leak-free, reattach the spray head. Routine aerator cleaning every six months, soaking the screen in mineral descaler, will keep the stream smooth and prevent backpressure within the pull-down assembly.
