I put Aragon 3 in it (from chlorine, iron, salts). I prepare water for the bath (not the kitchen). I live in a high-rise building (Krasnoda). There are a lot of salts in the water from which you itch all over after a shower. It also smells of bleach after rains (probably they pour more). Well, I already got the crazy white coating on expensive mixers! So I want to get rid of it first. Aragon3 has ion exchange resin so that should help. Well, at least it will be less and that's good. I also put a 5 micron filter in front of the aragon, so that the aragon lasts longer. I also wanted to put an aquashield (aquaflow), but then I read about it on the electronics forum and changed my mind (complete garbage, and even for 20 thousand). asks to leave a review, so I didn’t have time to use it yet and the effect is not clear, I just built the system, pressed it, but I haven’t installed faucets yet and haven’t connected plumbing, I’ll have to add a review later. If you are interested, then you know what to press;)