Athosanswered grow question 6 years ago 5.8 pH is a tiny wee bit low, but not much, it should be 6.0 as the lowest, highest should be 7.0; as for soil runoff, 100 PPM is practically nothing, that soil is devoid of any and all nutrients, the idea of using soil is that it gives the plant a buffer of nutrients, using (or buying soil) and then flushing it is counterproductive since you loose the very nutrients that you buy soil for.
The following information is from my 2nd run, using All-mix soil from Biobizz, it will give you some idea about runoff in soil. Prior to flowering, I transplanted to 3 gallon (11 liters) pots (from 2 liters or half a gallon), the first run off was 10.000 PPM, no feeding yet; at 2 weeks the runoff was 8.000 PPM, no feeding yet; at 4 weeks old they showed the first signs of PK deficiency and received a 500 PPM feed, the runoff was 5.500 PPM; at 5 weeks they received a 600 PPM feed with a runoff of 4000 PPM; at 6 weeks old they received a 700 PPM feed with a runoff of 3.700 PPM; at 7 weeks, the feed was 700 PPM again and the runoff was 3.500 PPM, at 8 weeks it was given water only and the runoff was 2.500; after 9 weeks they were harvested.