DIY Hydroponic Solution 

19.9 Dimensions: H 7.87, W 21, D 33 $17
15 gallon mixing tub
Fill tro 15 gallons?
Dimensions: H 6.0 in, W 20 in, D 28 in  $7.88

To make a hydroponic solution using water soluble  24-8-16.,  1.5lbs mix 2 teaspoons of the fertilizer with each gallon of water your system requires. Add 1 teaspoon of Epsom salts (magnesium sulfate) per gallon and mix until all of the solids dissolve. Only mix what you will use right away, since the solution will lose strength if you mix it up too far in advance. The water will be blue once you're done mixing.

Expert Gardener Water Soluble$3.88 1.5lbs
Delivered 6.69  Delivered
Epsom Salt $4.89 delivered 4lbs
8lbs