Product review (1 stars): NOT for hard water - Leaks
I am terribly distressed by this product.  First and foremost, it is for sediment, not hard water.  It works for sediment, but I could have purchased a much better product for much less at the local hardware store for sediment.  Second, it is easy to install, but getting the leaks stopped is a major issue.  On my first attempt, I ran into issues because it is impossible to get sufficient torque on the lid without mechanical help.  After several hours of Teflon tape, plumbers puddy, and various grips, I got it installed without a leak.  It worked reducing the sediment, but I noticed less and less efficiency within a few weeks.  I then learned that the filter needs to be replaced every 30 days.  Are you kidding me?  I have to take the darn lid off again, and then get it back on without leaks?  The lid is plastic on plastic.  It desperately needs a better gasket.  I tried and failed constructing a gasket.  I am giving up.  I can't get it back on without a leak.  Do not buy this product, unless you are a master plumber.