I have a Grohe EuroPlus kitchen faucet, nine years old. Water leaks from the base when it is turned on. I contacted Grohe and they sent a new cartridge. I installed it but the leak continues. The owner's manual mentions applying special grease. However, it doesn't say where to apply this grease. Can this be contributing to the leak and where do I apply the grease?:confused:

Nice faucet. They used to be very fashionable. But also, it is older model faucet. Usually, cartridge is not the cause of leak. If the cartridge leaks, the faucet drips. The cause of leak can be:

1. Leaking Hose
2. Loose handle
3. Worn out washer between handle and hose
4. O-rings inside the column
5. Loose water supply lines at the body connection

First make sure the handle is firmly screwed in into the hose socket with good washer between the handle and seat of the hose. If that connection leaks then it leaks inside the body of the faucet and down to your cabinet. 50% of time this is the problem.

Due to the age of the faucet I would also suspect the O-rings inside the column. When you install new O-rings than you have to apply the grease so you don't clip them while installing column collar.

Let me know how you did... Milo