Over time the pipes will rust.
Once in a while the city will have to work on the water main pipe and it can temporarily dirty the water.
Chlorine, fluoride, and god knows what else is added to the water on purpose.

a Brita filter sounds pretty nice to me.

but if it doesn't hurt the plants to use what tap water you've already got, keep using it and save the money to buy something else that the ladies might enjoy.
GreenDestiny Reviewed by GreenDestiny on . Brita water or Faucet water? I used Faucet water in my grow, but was wondering if anyone tried this? Rating: 5