If I owned a commercial brewery, or my own house, I'd install a nice RO or other filtration system (it would be nice for cooking and drinking as well).
However, as a renter and a brewer of 5 gallon batches, I'm happy with the campden tablets. They are cheap ($2.99 for 100 tablets, which is enough to treat 2000 gallons of water), extremely effective, and easy to use - just crush up a tablet and add the appropriate amount to the brewinq liquour while it's coming up to temperature.