I have been lowering my TA over the past few days. It started at ~ 150 and now is near 90 ppm. I have been using up my dry acid and starting to use muriatic aliong with aeration. My last slug of muriatic was ~ 18 hours ago, dropping the pH to ~ 7.0. Despite continuing to aerate for ~ 18 hours, the pH this time has only increased to ~ 7.3 or so. Usually, it would only take about 6 hours at the most. That is to say, the correction of pH using aeration is much slower this time despite having a lower TA (buffer).
Is it time to give up on the aeration? If need be, should further pH correction be done with Borax?
Is it time to give up on the aeration? If need be, should further pH correction be done with Borax?