[IBU] Anyone use a water filter?

[Mark McAndrews]

I brew outdoors with a cartridge filter and regular guarden hose. I usually 
run a couple of gallons through the hose onto the lawn before I start 
filling the brew kettle to get rid of any water that has been sitting in the 
hose for any amount of time. It has worked for me.

I also have an undersink RO system. I'll usually run a couple of gallons 
from that into a bucket and mix with filtered water to reduce the level of 
minerals in the water used for brewing.