That's good water. I'd just go with a filter. Most of the time RO is overkill on city water. RO is best where you have difficult to remove contamination like sodium, nitrate, and fluoride. https://www.amazon.com/06-250-10-GREEN-Reduction-MatriKX-GREENBLOCK-06-250-125-975/dp/B01N5TM7OM#
That's good water. You'd be fine with a decent filter. https://www.amazon.com/06-250-10-GREEN-Reduction-MatriKX-GREENBLOCK-06-250-125-975/dp/B01N5TM7OM#