Can I flush without phd water last 3 days

Would this cause a shock to my plants that I have been giving 5.7-5.8 water all throughout the grow. I am running out of ph down and will not have any left for the last 3 days of flush. It was a 2week flush also. Should I buy more ph down or can I get away with it the last 3 days without hurting my harvest? Thanks in advance!

Are you gonna re- use that soil if so ...ph ya water if not blaze away ...re amend you soil by adding 50% new stuff or build ya own either way look to your addition of calcium to fix your continual ph issue?

May I add that they are rockwool cubes 6x6

since flushing itself causes shock in the plant, yes this will cause your plant shock but not because of the non PH'd water.

Your good bro