which ro unit to get?

[christyf5]

I'm interested to hear more about this DIY recharging of the Tap Water Purifier resins. I have one myself and thought I needed to go out and get a refill for $30. Since they are considerably more than that here on the island, how exactly does one recharge it and how often can this be done??

Christy [img]images/smiles/icon_smile.gif[/img]