First, you need to be SURE what's in your water. There are plenty of Water Testing Centers around. Contact a few of them and find out 1) What tests they perform, and 2) Will they recommend a particular type of Filtering System (not necessarily by Name), and 3) What's the fee. You can find test centers for as little as $15. Even for $25 or $30, it's $$$ well-spent to get expert advice on the PROPER filtering system.
Truthfully, from here, it's hard to make a recommendation. My best to ya and hope this helps.