You can use chlorine, but would need to either sequester or remove the metals in the water first. You can use a metal sequestrant product such as Jack's Magic Pink Stuff ($28 which is enough for 10,000 gallons). Another alternative is to remove the iron from the water during filling of the pool since it's relatively small in volume using a product such as Metal Trap (though it's not cheap -- $86 for a 10,000 gallon pool, but for your likely smaller pool you should be able to use this for more then one fill). There are also ways of forcing iron to come out in your filter, but that's for regular pools with sand filters and I don't think would work well for yours which likely has a weak pump with poor circulation and a small cartridge filter.
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