So my seedling just sprouted and I know PH is a big deal. So how often do you check your PH? Every time you water? Do you mix up a big jug of it to have for multiple watering or no?
I would check every watering
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Just before you water or feeding them 
, but you need to check the pH every time.
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For my hand watered pots I mix up nutes in 5 gallon pail. I set the pH as desired initially and then each day, when I fill up water jugs I check the pH again.
I have a 12 gallon reservoir for my indoor plants and I check the pH every couple of days in the res and in the pots.
Anally obsessive is probably not required but something between that and never checking is where you should land.
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I check and reset ph to 6 every day in my hydros and I ph6 my nute water for my 1 coco coir pot. I just mix that up in my watering can as needed (1qt every 3 or 4 days right now). I know I’m doing right with the hydros, but honestly, I don’t know for sure what I’m doing with the coco. I see people talk about checking ph of the medium and don’t really know what that means or how to do it. The meter I have is for liquid.