Can anyone recommend any water filters? Are there only tap type filters or are there any of the 0.2 micron ones for filters like PUR or Brita?

I get that the plastic piping that has replaced the old copper pipes is a source of Mac but at least it’s not building up in my shower head. I thought I was minimizing my risk by only using the shower when I washed my hair but when my husband took the old shower head down, it was full of water after 3 days. At least I know this one is dry and clean between uses!

Thanks in advance for any information people can share on filters.