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Rdwc huge ph fluctuations

Hey everyone, first post here. Looking for some insight. This is my 4th hydroponic grow, up until now all have been dwc.
Setup:
3 reservoirs- 2 in tent 1 external
Alita 40 air pump, 2 stones per res
General hydroponics nutes
Using ro water
Maxisun led lights
Recirculating pump guesstimate at 20 gallons an hour
Total water volume is 30 gallons
Feeding regimen:
All nutes added at 2/3 strength
Mix armor si for one hour with pump and air stone
Add calmag mix 5 min
Add trio, micro, gro, bloom...

Rdwc huge ph fluctuations


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