A little while back I posted about hard water and a faucet filter I bought from Amazon. My water is ran through a softener but still has mineral. Rusting the sink and leaving film on my shaving equipment. I had to change the filter and thought I would share the dramatic differences. I recommend if you have mineral rich water. I have had this for about 3 months. 3 for $12 on amazon. So approximately $1.33 a month for me, may be more or less depending on your water situation. The difference in the 2 sinks in the bathroom and the old and new filter. The filter on the left is new.