My house has 3 of these in series:
The last one is leaky. I tried using a spare housing, I replaced the O-ring, and greased it up with faucet grease. Is there anything else I can do?
When I bought the house it was fine. After the first or second filter change it started leaking a little bit -- I put a pail under it and never had to empty the pail. After this last change it's probably leaking a gallon per day.
