That is very true. But I have read where some people do it with ph perfect. I don’t. I try and not use ph at all. Always adding something to get it down. Even with watering I use FoxFarm sledgehammer . But very true. You never mix pH up or down. That’s why I worry about tapwater sometimes especially on the weekends.
I’ve been watering with PH 7,3 lately, plants don’t give a fuck.
Doesn’t matter, especially when you grow companion crops.
Dr. Earth Acid Mix, or Citric based TNB Down is what I use, in my bastardized grows, part salts/part organic. SO many choices in todays world.