You can really use any. RO membranes in combo with 3 filters get rid of everything. It does readd minerals back but removes all the crap out of tap water.

I have a artesian system from theperfectwater.com around 300 plus the permeable pump so closer to 400. Filter change every year to 2 years. RO membrane change every 5-7 years. A new 4 to 5 gallon tank every 8 years. I had same system for 15 years now.

As for shower filters anything not made in china. I swap out every 4 to 6 months.