On Monday, January 30, 2017 at 7:45:37 PM UTC-6, wrote:

A lot of them aerators have a plasric thing that looks like a washer.
Has a hole about 1/8" in it. Just remove that piece and reinstall the
aerator. Or drill the hole bigger in it.

Removing that washer looking thing will increase water flow. Ugh,
I hate them in showers.