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High EC leads to dropping PH?

High Guys
I have a question.
I've had quiet some time growing in soil and it all went fine.
I switched to hydro about a year ago with well... Ok results. Pulled around 300-350g on 4x4 with 400 watts.

I am using the Lucas Fomula on RO water with Cal/Mg to EC 0.2
Top feed with clay pebbles watered every hour.

My big question is the EC.
I'm at Bloom Day 30 atm and in all of my grows I never made it to an EC higher than 1.2
As soon as I go higher my ph starts to drop and I have to bring it up...

High EC leads to dropping PH?


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