Started flush 2 days ago and ph is always dropping

started flush 2 days ago and ph today was 5.1, is it normal for ph to drop when flushing ??... AT day 59 of 12/12 barney's 8 ball kush

Bump..........

some pictures would be nice

Why ?? I asked a simple question.

If its just ph/water its hard to understand. When PH drops its usually because the plant is up-taking more water then nutes and leaving the acidic nutes causing a lower PH. but a ph drop in pure water? idk man sounds odd

SInce you have no nutes, there is nothing to buffer the pH changes, so bacterial activity that was negligable before could now be causing pH swings.

PH is not an issue in flushing. PH affects nute uptake only, not water. And it should go down if it is absorbing salts and unused nutes from the plant. Think about when you add nutes to water, pH goes down.

since when does ph matter in flush? i never even glance at the tds or ph during flush

Spanky84 said:

SInce you have no nutes, there is nothing to buffer the pH changes, so bacterial activity that was negligable before could now be causing pH swings.

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This. It's to be expected for the pH to swing a lot if you are using plain water (there's not much in the water to hold it at any specific pH and any little thing can shift the pH a dramatically). Your nutrients would have been providing the buffer in the past.

Bingo. Water by itself has no buffering capacity and thus even the CO2 in the air dissolving into the water can form carbonic acid and lower the pH quite a bit. Of course pH means absolute nothing in plain water.