I recently refilled my pool and the TA of local water is about 170-180. I've been aerating to raise pH to around 8, then adding muriatic acid to knock it down to 7-7.2. Rinse and repeat. I'm at about 120 TA now after a few weeks, but my CH is also going down and is around 200. I'm still within the safe CSI range, but was curious if I should be trying to get within the CH ideal levels of 350-500. If so, what's the most effective way to do that with the least impacts to increasing TA (which I'm still trying to get closer to 80)?