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Decreasing humidity?

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Hi folks, would anyone know how to decrease humidity without having to spend coin on a dehumidifier?

I have flood and drain system under 2 LED panels with temps ranging from 21-26 day and 14-19 night. I run a 1120cfm extraction fan with controller running @ about 25% at 15 min on - 30 mins off with the lights on and a 350cfm inlet fan running 24/7.

My res is outside of grow space but has not helped. There is also a pedestal fan running as long as lights are on.


Any ideas for an easy fix here without having to fork out the cash for machine?


Space is 1.6m x 1.4m x2.1 but only half is populated with growth.

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