Yes but if your really doing it right you would be using a soil ph meter to monitor at the soil level, not the water…….
most soils are pre buffered. Liming agents are used to keep balance. In soil microbes snd the plant itself actually regulate ph. By dumping phosphoric acid on soil the microbial life is destroyed, thus interrupting plant health and food source. Not doing a thing for you.
most people struggle with dirt growing is the fear of overwatering snd the fear of wrong ph water.
IMO: if the water ph is near 8 still ok really. Better than adjusting water. But one might think about a different filter to bring h2o back to more acceptable ranges. Usually we overfilter, stripping all minerals from the water which actually is what’s responsible fordifferent ph ranges.
also ph of soil is highly affected by soil moisture. Underwatering causes more fungal dom soil which raises ph. Well saturated soils with will be lower naturally with bacterial dominated microbes.
this is an acclimation of experience mainly. Snd for anyone curious my ph is general 8.1 h2o. Somehow magically my medium/soil is always 6.5-7. And even more magically is the fact that my vegging plants maintain 6.8-7 and the very week I flip to flower the containers drop to 6.5. Why??? Cause the microbes dictate ph. The plant knows it needs more P snd K and that those elements are available at slightly lower ph. Plant root exudates attract specific bacteria and fungi to accommodate the change in nutrient demand. Fucking magic. End rant