I've replaced 3 faucet cartridges in my house. The 2 oldest repairs/replacements (replaced about 1.5 yrs ago) are still good. The most recent one is about 4 months old but it has started leaking again.

When I went to get the replacement cartridges, I brought the bad one to the store to match up so it should be the correct one.

Is there anything I should look at to fix it to stop it from leaking again? I doubt I did anything wrong since the other two are still ok, although it's not outside the realm of possibility that I made a mistake.

I plan to replace the rubber seats (the rubber thing sitting on top of the spring) first before I buy a new cartridge to try out but in case both of these steps don't work, what should I do since logically, replacing the cartridge should fix it?

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    Look for foreign material or burs on the machined surface inside the old faucet. There could be a sharp edge or some trash that wears on the cartridge. – JPhi1618 Jun 10 '19 at 19:47
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    I was also thinking of scratches these tear up the seals, I have seen damage caused from scale/rust or small gravel in the past that scored the valve body so new seals only lasted a few months. – Ed Beal Jun 11 '19 at 15:20
  • @EdBeal thanks for your reply. I didn't see any scale or rust but part of the top of the seal was worn out a little. I tried twisting the cartridge a little so the bottom doesn't rub/cut into the seal. We'll see how long it lasts. – Classified Jun 17 '19 at 18:05

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