Kohler Katun Widespread Bathroom Sink Low Flow - K-R78039-4D-BN

In today's video, I’ll walk you through troubleshooting low water flow on a Kohler Katun K-R78039-4D-BN widespread bathroom sink. I couldn't find a video on this specific wide spread unit so wanted to help. I was experiencing just a trickle of water and wanted to boost the flow. My first step was to contact Kohler for initial guidance. They recommended replacing both the hot/cold cartridges, as well as the aerator, due to possible blockages or wear since I purchased the sink in the summer of 2021. Kohler kindly sent the parts for free, so I swapped all three components in hopes of improving the flow. While the flow did improve slightly and was more directed, it wasn’t enough, so based on some other videos I watched on similar, not exactly the same, but similar units, my next step is to remove the faucet head, inspect the flow inhibitor and possibly remove it as many others have done. I’ve reached out to Kohler to confirm whether this faucet model has one, and I’m currently waiting for a response. To ensure everything is working properly, I also had a professional plumber check the water pressure, and they confirmed that the pressure coming in from the city was more than enough to produce high pressure. To further confirm, I had another Moen faucet in my master bath that had flow issues and for that one, kept the same cartrides but replaced the main faucet head itself as it likely had mineral deposits or some type of blockage. The resulting pressure was almost overwhelming at full throttle so that was a great fix that worked for that unit without swapping out cartridges.
Unit: Kohler Katun Widespread bathroom sink faucet, 1.2 gpm
Unit# - K-R78039-4D-CP
Replacement Cartridges:
Hot Valve - GP1152350
Cold Valve - GP1152349
Stream Straightener Kit - K-1307518
Helpful Links:
Product Page - www.kohler.com...
Install Guide - techcomm.kohle...
Home Depot Name: KOHLER Katun 8 in. Widespread 2-Handle Bathroom Faucet in Vibrant Brushed Nickel
Home Depot Black Matte Version - www.homedepot....
Warranty - www.kohler.com...
Product Support - www.kohler.com...