So I have this one plant... (PH question)

MK Ultra. It needs a ton of PH down to keep it in the right range. I'm talking +20ccs a day in 7 gallons of solution. If I only adjust once per day it will get up to 6.9. I have same plants from same mother in a different location and no notable PH issues. The plant in question looks healthy, no visible symptoms and everything is coming along but I've never had to use so much acid to get the PH right.

I use a product called Recharge in the first couple weeks of veg. It's a multi-strain microbe product and I swear by it. It was also used in both locations I mentioned. Same strain, same treatment, same fertilizer, everything. Any ideas on what can cause such extreme PH swings when there are no visible plant problems?

Well if it's a clone it shouldn't have anything to do with the plant itself. You said the others are in another location, so what other differences? Different water source? Do you bubble the water while pHing in one location and not the other? Different nutrient solution?

Almost everything is the same. Only differences, the plant in question is single so 1 grow bucket and 1 rez while the other location is 2 plants so 2 grow buckets, one rez. The lights are both LED, same emitters, roughly same wattage per square foot.

According to the chart it's FALLING/FALLING/RISING which is "almost perfect" except for the massive amounts of PH down I'm adding.

Plant looks fine so I'm not sure anything needs to be done. One possibility is that a particular strain of microbe has dominated in this particular bucket system, but this Recharge I've been using for quite a while now and never had similar issues.

Thanks for the inputs.