there are 6 rockwool slabs per table with 4 plants in 4" cubes per slab.
The ideal plant height when finished is 2 - 3'.
The 2 valve system works great for draining of the reservoir.
Simply close the valve going the tables and open the valve going to the drain.
Now you can use the same pump that runs your system to drain your reservoir.
The Nutra-Dip Ph meter will give you constant accurate readings, maximizing your yield.
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