I bought a shower head the at the furniture shop Nitori since I heard the shower head could work for some people with eczema and one of my children has eczema-like parts of skin time to time. It filters tap water.
The first day when I used it, I noticed my hair was so smooth and soft. What a surprise! For that, I think it's worth buying the shower head.
For my child's eczema (or eczema-like skin since she has never diagnosed that), it's getting better now but it could be because the dry winter is gone. now. For accurate assessment, I need to wait till we enter winter. But I am quite happy with the product.