This is a terribly old thread, but Depth Charge is a local metro Detroit hand made hot soil. Think something similar to Subcool Super Soil with an updates recipe.
I have been using Depth Charge in conjunction with various fertilizer spikes with great success for many years. Very little liquid feeding needed.
Things may be slightly updated now but a older list of ingredients as follows:
Ingredients: Sphagnum peat moss,perlite, worm castings, bone mea,l blood meal, bat guano, volcanic rock dust, Azomite, kelp meal, alfalfa meal, rock phosphate, dolomite lime, magnesium sulfate, humic acid derived from freshwater humic substances, bird guano, crab shell meal, shrimp meal, neem seed meal, Bokashi, molasses
Great product. Cheers all ,happy growing.
Edit..You buy it at Indoor Organics in Auburn Hills. Try it out for low matience high quality organic gardening.