Thank you for your inquiry! Most issues with low flow, such as yours, are due to some kind of debris entering the faucet from your water line, which can cause noises as the debris moves, or cause low or sporadic flow as the water continues to move the debris around. We would advise flushing the valve body and Innoflex PEX lines of the Delta Essa Pull-Down Bar/Prep 9913-DST faucet.
To flush out the valve body, so that these parts do last as long as possible, please first turn off the water supply to the faucet. Gather an adjustable wrench, some towels and a bucket.
Disconnect the hot side Innoflex line. Move the handle to the full on position, middle temp.
Point the hot side Innoflex line into a bucket. Turn on the cold supply valve full.
Let a gallon or two flow into the bucket. Shut off cold supply.
Check bucket for debris. If no debris, empty bucket and run one more time.
Move handle to off position.
Reattach hot side line. Turn on both water supply valves.
Date published: 2018-12-15