PH goes up like crazy

I'm in perlite hempy buckets and using Maxigrow Maxibloom nutes.

I water at 5.6 and within 24 hours the water in the hempy rez is 6.6.

I flushed really well just yesterday and got my runoff back at 5.6 and it's back up this morning.

Do you have PH issues in your grow? If no, what media/nutes and type pot do you grow in?

Do you have air stones in there? They can cause pH to do wild swings.

Renfro said:

Do you have air stones in there? They can cause pH to do wild swings.

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No but I have had some vermiculte. I rinsed most of it out.