The PPM reading is mostly for total NPK fertilizer mix. You add the supplements after you check the NPK reading. Otherwise the reading will be off. The idea is to enhance the NPK fertilizer we use. If you subtract the supplement from the NPK then there is no enhancement only a miss representation of the true EC/PPM. One way to know if the nutrients are supplying enough fertilizer to the plant is to use a Brix meter and check the absorbed sugar and nutrient levels of the fan leaf. If you grow in dirt then you know it takes days or weeks for a problem to show up and sometimes even longer to correct.

I have had many successful grows with the PPM finishing up around 1600 â?? 1800 PPM then I add supplements like CalMag plus 5ml to the gallon and awesome blossom, or Big buds and fulvic acid. As well as either advanced nutrients Piranha or Tarantula microorganismâ??s products. All that is added after the NPK is mixed and registered.

Did that make any sense to you?