I am using gaia green 4-4-4, its just a meal but all purpose fertilizer, not sure how close to plant tone it is, but even mixing it into the top 1-2 inches is difficult for me with the roots, I have to add 2 tbl per gallon which isn't much but it takes a bit long to drain but only around 30-60 seconds more, I think it has more to do with the fertilizer soaking up the water before going down for me.