- I've been using this since 2022. the water coming out is great. At the entrance, the hardness is 130 units. at the output is stable 4 units. All dishes shine, no plaque. Very tasty water.
- We added the prefix PRO, who is this for? The first filter is an ordinary k5. The first releases were collapsible and cartridges cost a penny. probably unprofitable to sell collapsible and replaced with expensive monoliths.