If it's the same model as mine, the answer is this:
Remove the cap nut nut at the center of the spout pivot
Remove the spout (can't remember if you really have to)
Turn the water on slightly (either one) and a plastic and rubber cartridge
should lift out of the center where the spout went on
Tap the cartridge on the counter to remove specks of sand and dirt and such
Put the spout back on, and turn on one faucet, and then the other one to
flush out the system
Remove cap from spout pivot, and put the cartridge back in
Reassemble and test. Please let me know if th is does it for you.
Christopher A. Young
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