We were referred out by service plumbing to check and clear the slow kitchen sink. On arrival I checked the sink and it was very slow to drain when filling up the sink and draining. I recommended jetting the line and a bottle of Endure for drain line maintenance and as a septic booster. Customer agreed. I removed the p-trap and ran the jetter down the line 4 times successfully clearing the blockage. I then tested sink by filling it up and it was draining very smoothly. Customer is aware they have Cpvc and does not want to get it looked at at this time.