I've used the Expert 15-30-15 , a good product, much like Miracle Grow All-Pupose. A couple of thoughts.
When these are mixed at the outdoors recommended 1 tbls per gallon, you're going to get a EC reading of about 2.8 mhos or 2000 ppm Truncheon and this is without any significant Cal or Mag. A normal solution of the HG 4-18-38 with Cal/Mag for me is 2.0 mhos.
This is why the Expert and MG products are recommended every 2 weeks, the dose is fairly strong. But, you're going to need to find Cal and Mag somewhere.
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