I don't use them, so not that savvy, but here is a link to one of the shower heads that some members have purchased:
https://connect.mayoclinic.org/discussion/shower-heads/?pg=5#comment-255508
And for filters, you need to search for ".2 micron filter" These filter very fine particle, including mycobacteria. They are generally used in combination with either a 2 micron or 5 micron prefilter. The you choose faucet end, in-line or whole house systems. The filters are spendy & the cartridges need to be replaced every 1-3 months depending on your water.

Sue