Very much like how our immune system uses it's white blood cells with anitbody production and the like. Perhaps like a histamine response also. The healthier the population of wbc the healthier the person.
I have a water question for everyone. I am currently running my final group of plants through flowering where the medium used was 1/3 Coast of Maine Bar Harbor blend, 1/3 larger perlite, 1/3 ecw. Nothing else. Here is a link for the Bar Harbor blend.
http://www.coastofmaine.com/soils-barharbor.shtml
I have been using RO water. 2 ppm and ph 5.2ish. I feed with aact. I have my first homemade "supersoil" mixes cooking for 4-6 more weeks. I am questioning if I should continue to water with the RO water because I am seeing signs of ph lockout in many leaves. My other water option is well water with a ph of 6.5ish and ppm of 60-80 depending on the season. My well water does have a water softener that we never fill with salt ever. I think my current mix can't handle the RO ph. Any thoughts?