I use a blend of coco/sunshine/worm castings. 33/33/33 and I only use Growzime, Liquid Carma, Pure Blend Pro for soil and calmax. I feed at a rate of no more than 30 to 40% recommended. I do give then a blast from week 2 to 6 of no more than 60%. I give them water for the last week which uses up any leftover nutrients.
I never replace the mixture. coco is good for a couple of years and worm castings are good for 2 to 3 years. Sunshine is peat-moss. All are recyclable too!
I grow in 4x4 raised beds 12 inches tall. I plant 5 rows of 4 plants that are 20 inches tall with 1 1000 over each bed.
Harvest time I pull the plants up by the roots and cut the root ball off, this takes with it about a 6 inch pots worth of soil. 20 plants = 1/2 contractor bag of soil and roots. I recycle it through a screen and use it to plant my clones in. Repeat as necessary.
To prepare to plant again I use my hands and dig down to the bottom, lots of roots down there. I turn it all top to bottom and plant the new ones. Any big clumps of roots i toss out.
I have grown many ways and can tell you this is not only the healthiest, earth friendly, best tasting, bug free (worn castings do that) EASY, EASY way to do it but the best yields ever and consistent quality.
How much do I get 750 grams per lite = 1.75 lbs. I think this is a very good yield and it has taken years to get there. I have heard of people getting 2 lbs a lite I just have never met one.
Peace