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This is a calculation to determine which size reservoir you should be using for the corresponding flood table size.
Height you wish to flood in the tray (H) x Width of the tray (W) x Length of the tray (L). Convert feet into inches. Then multiply the cubic inches by 0.0043 to convert it into gallons.
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Example:
For this example lets use a 3’ x 3’ tray. The plants will be growing in 6”x6” rockwool cubes, thus the tray will flood up to 3”.
[ 36” x 36” x 3” x 0.0043 = 16 gallons]
[W x L x H x 0.0043]
Some estimated examples for you (3″ Flood Height):
2′ x 2′ = 7.5 gallons
2′ x 4′ = 15 gallons
3′ x 3′ = 15 gallons
4′ x 4′ = 30 gallons
3′ x 6′ = 35 gallons
4′ x 8′ = 60 gallons