even some of the most nasty water can be treated...in your case a metal remover should be used at fill, ie metal gon, metal remover, metal out, etc etc. each brand of chemical has a different name but they all basically perform the same task, also in your case a good pre-filter should be used. Like I said the water can be treated but it will always takes a little longer...the tub will take longer to fill with a pre-filter, and you may find yourself pulling your filters and hosing off some of the residual metals for the first couple days.....some of my customers avoid the "process" by having chlorinated water trucked in for around $150-$250 per fill depending on location, amount of gallons, etc etc