The Grohe Ladylux faucet has a handy, movable sprayer head attached to the faucet body by a hose. This hose carries the water from the body of the faucet to the sprayer after the water mixes in the cartridge. Therefore, taking the hose out and replacing it does not involve a complete disassembly of the faucet. You will need to take the spout off in order to remove the hose, however. This task will take about a half hour for an experienced repairman.
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Turn the water off under the sink to prevent an accident during this repair. Close both water valves on the water lines in the sink cabinet.
Pull the sprayer head out of the spout mouth and find the connector on the base of the sprayer head. Turn the connector counterclockwise to unscrew it and remove the sprayer head. Use a wrench to loosen the connector if you have to. Place this part aside for now.
Disconnect the spout from the faucet spout base. The part snaps into the base, so carefully turn and pop the spout out of the base with your hands. Grasp the spout and base with a towel for a better grip.
Disconnect the hose from the spout base connection by unsnapping the connector from the spout base. Take the hose out of the base.
Slide the new hose through the spout. Connect the new hose to the faucet base by snapping the connector into the faucet body. Push the spout back into the base of the faucet and snap it into the base. Screw the sprayer head back into the top of the new hose by turning it clockwise until tightened.