We used Brita water filter attached to the kitchen sink for a few years. Used it for drinking water, coffee, filling the pets water dishes, cooking, ect.
Figured we were doing the right thing. Changed the filters when the little light went from green to red,,yada, yada.
Well, the unit itself had to be replaced a couple times, It started to leak around the fawcet connection and wouldn't swivel like it was supposed to so we decided to try something else.
We went to the Zero Water thing. Entirely different in that it's a plastic dispenser that you place in the fridge. You fill it with tap water in the top and it runs down through a replaceable filter into the bottom and from there you can use a push button tap to fill your cup, bowl, ect.
Kind of a pain pulling the thing out of the fridge and filling it up,,keeping it filled up, but we got used to it very quickly and now it's just part of the daily routine. It does take up a side of one shelf in the fridge,,so consider that.
It comes with a 'water solids indicator' for lack of a better term.
Just a digital indicator thing (like a large 'pen') you turn to on and place one end into the water to get an instant reading of the solids contained in the water.
Yes it does register .000 in the filtered water.
We checked the out of the tap water and it was something like .629.
We then checked the Brita filtered water (new filter installed the day before) and it registered .624.
That was an eye opener...
The non believer in me made me buy another water checker thingy (I didn't realize they were so inexpensive). It confirmed the readings of the one supplied with the Zero Water kit.
It says to change filter when the water registers '.006 solids' but my God I was drinking stuff 600 times that and I'm still around! So I let it go a ways further.
But I do admit the coffee tastes so much better as does a plain glass of ice cold water. We feel better that the puppys and kittys are getting better water too.
It may be a good solution for some one not wanting or needing to rig the whole house up to an R/O system which was our case.
We just wanted some better tasting drinking, cooking and water for the dogs and cats.
Hope this helps.