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first time flood and drain project, major PH problem.

Hi all.
I have switched from using coco to flood and drain, and this is my first run.
I'm running 18 x 14 gallon tubs with clay pebbles, they are fed from an 80 gal reservoir.
When fully pumped out the nutrient level comes up to about an inch below the surface of the pebbles. It pumps up in 8 mins and drains in 30 mins and repeats every hour.
The temp in the grow space is 27C, the res is situated outside the building and is cooled by a heat exchanger (it's summer here) so it sits around 20C...

first time flood and drain project, major PH problem.


January 28, 2020 at 07:23PM

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