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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

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