My GraviTea has been in constant use for 36 days with no scale in my kettle!!! Only tiny traces on some glassware I use daily and generally rinse only. Seems like there is no iron deposits like I used to have as well even though it is not spec'ed to remove Iron?
Now I need to consider replacement filters I guess.
One thing I have also noticed, tea stains adhere to scale. Get rid of scale depositing minerals and I have virtually no tea stains (keeping in mind I drink greens the vast majority of the time).
PROS: Sleek design; took two minutes to filter one liter of water; trap door on top makes one-handed filling simple; two-month filter life.
CONS: Filtered water still smelled and tasted like tap water.
OK, almost 4 months and I have not had any need to descale my kettle which previously needed it every week! All my teaware is staying so much cleaner. Also, metal such as iron has not shown up which is odd since it is not spec'd to remove iron, etc.
I think that tap water would have to improve in taste, it descales and dechlorinates. Not sure about flouride though.