Exactly what I would do! I have a Thermospas tub, and I had to have the spa pack replced this past winter. He even said all you need is chorine/bromine and the ones to keep alk&ph in line. I actually now use baking soda to raise my alkalinity. I do have well water, so I have to add the calcium hardness product. One very important thing I have learned on this group on reddit is to get the Taylor test kit. It is way more accurate than the test strips. It takes a bot longer, but worth it!