Your reading that wrong.See how those chemicals are coated for slow release.Thats the problem.How are you gonna flush if there are chemical nutes in the soil.Plus everyone says it's pretty acidic.I know Miracle grow used to have stuff in it that was real bad for MJ.But they stopped using it.So now it's the time release that is the problem.IF your going to use pre mixed soil w/ nutes/ go organic and make it easy on yourself!