Beachwalker
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I'm not sure on the time line but I think this happened with both the GH PH down product and the citric acidWas it aerated well before sealing it up? If using citric acid with a bicarbonate source the citric acid will react quickly and the ph will increase as a result of the acid being broken down. This is a big reason why it's not good for hydro and why phosphoric or sulfuric acid is better in hydro. In soil unless you need to bring the ph down to prevent precipitate then it's best to just ph right before feeding. But this also goes to my opinion that the soil will buffer ph so the only real time I feel you need to ph nutrients for soil is when using something like silica that can increase the ph drastically and cause precipitate, other than that it's not necassary but won't hurt.
I never aerate my water, if it's lucky I let it sit for 24 hours LOL
In The Jug it never changes from 6.5 until I put it in the bubble cloner then it goes up like a rocket overnight and I'm not sure why?
Edit: I have to pH my 8.9 tap water but I'm talking about using a bubble cloner only, it goes up dramatically overnight in my bubble cloner?