I run Greenleaf Nutrients Mega Crop, super thrive and love. The Entire operation is gravity fed from a 55gal barrel of GLMC. The 55 feeds (2) 30 gallon coolers that pump to the (orange 5gal) and (blue 10gal)coolers respectively. There is no need to access the roots after the plants start to fill the screens. I run the nutrients for 2-3 weeks, adding every other day to keep the ppm stable. This pic is older. It was taken before the screens were installed. I was testing to see how it would be without them. I'll never do that again! You can see the 55gal up on blocks on the right side between the nursery and veg area. Closer up of 55 on the right. Nursery on left. Top lines feed, bottom lines dump. Trichs.