Contingency water

i'd check where that lockup falls on the ph scale and use lower than distilled if what youre locking out is more available at say 6.2. lower the ph yourself with stuff from the store. pretty sure its molasses that people use. i imagine the distilled will get you some of the locked out nutes but you might need more than a gallon to "mix" the soil up in a ph sense otherwise you might be going back to distilled water every week or so if the lockout does happen.

just wondering but how old is the plant? i had issues with 7.5 tap water (150 tds) after 3-4 weeks of veg

36 days on my 2 Scoops strain. This is just after transplanting and watering her.

hmm, interesting. anything added in the soil that naturally lowers the ph? the stuff i use (reds biochar/soil) said it doesnt need to be ph'd but my first grow and my current grow showed me otherwise.

Kepp89 said:

hmm, interesting. anything added in the soil that naturally lowers the ph? the stuff i use (reds biochar/soil) said it doesnt need to be ph'd but my first grow and my current grow showed me otherwise.

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I think the ffof grow fert that I use lowers the ph a bit. But I use half a dosage of my nutes, silica, micronutrients, etc. They mostly say to adjust the ph before adding to the mix.

Manure will lower pH if you work it into the soil.

Just about any fertilizer will lower your Ph, but since you are growing in soil it might not make too much of a difference. Have you checked the runoff Ph? RO and Distilled water have no nutrients in them and can be used for flushing but they probably won't change the Ph too much. I would think the tap water would balance out the acidity of the FF stuff. The truth be told, I haven't seen too many cases of nutrient lockouts caused by too high of a Ph, usually it is too low.
A slurry test and a runoff test should give you a better idea of what is going on deep in the root zone. As long as the plants are healthy and happy, I wouldn't mess with it too much. Once you start chasing Ph issues and lockouts, it can be maddening.