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You can also make an array of magnets (very strong ones) and run water through them. it won't soften the water but the water will act like it is soft for a short period of time.

[QUOTE=rolodave;1740806]My Bunn is 10 years old All I use is RO water Never had to clean the pot[/QUO

yea but RO water isn't really good for coffee. Good brewing needs some minerals in the...

You could buy a water distiller (around $240) makes about 4 gallons a day which you could use for many things. Otherwise just buying a jug of RO water at wally World is your best bet.