What water do you use to make your wine?

[reefman]

Reverse Osmosis as Duggar mentioned, and the second stage is De-ionization.
It's used for many things, but I use it for my Coral reef tanks, to mix new salt water.
It removes all heavy metals and other stuff from the water, which can cause real problems in a coral propagation tank. The salt mix that gets added to this water adds back any trace elements required for the tank.
I'll post a picture when I get a chance. The whole system cost about $140.00.
It requires filter cartridges to be changed periodically, depending on how bad your water really is.

 

[Green Mountains]

Which explains the Reefman.

Look at Green Mountains, putting two and two together.......

 

[reefman]

Yes it does...I've had the nickname "Reefman" since 1986.