I am trying to get my ppm to around 400. After watering the PPM was 197 so I added some CalMag and some Big Bloom to 1 gallon of water and tested the gallons PPM, which only came to 200 after adding 3 teaspoons of Big Bloom and 2 ml of CalMag. I was nervous about over doing it so I used that and tested the run off. The run off only tested at 226 PPM. How do I get the PPM up to the desired level without going over and hurting the plants? Do I need my gallon solution to be upwards of 500 PPM to bring the soil run off to 400? Do I need to use more than 3 tsp of Big Bloom? As always, thanks for the help.