Hi from http://www.pureshowers.co.uk,
In the past we've had quite a few questions regarding using shower filters in high pressure and low pressure home environments.
Generally any homes with water pressure of 2.5 GPM can install one of our shower filters without any problems with reduction of water pressure.
When you start getting under 2.5 GPM you will probably notice a small change in your water pressure when installing a shower filter.
Both products will work equally as well in filtering out nasties from your shower water and keeping your skin and hair protected and feeling great!
We hope this information helps you make a more informed decision.
The pureshowers team