Roots organic hp2 liquid organic suppliment, good P booster as well as calcium and magnesium, it is also design to work in conjunction with roots organic element and wont kill the life in your supersoil like the callated GH calimagic will, or make it anyless organic as the salt nutes will make it not organic at all.
Id like to correct myself as im reading this i realized id be referring to the HPK product by roots organic, it has P, K, calcium, and magnesium in it where the HP2 is just P and calcium, also i would reccomend reammending element and supplimenting with HPK throughout because the element was designed to be reammended and will breakdown faster if you are feeding the NLS microbe tea, the microbes will be steadily breaking that down for the roots to uptake and wont last as long as you think it might.
Thanks for your detailed response. Rather than Epsom Salt or another non-organic approach, I added coconut water powder to my base fertigation solution. It has a great variety of nutrients along with plenty of calcium and magnesium. I also added the HPK to the bag when I made my NLS tea that I applied at the start of week 4. So far I am very happy with the combination. There are no signs of any nutrient or pH problems. (https://growdiaries.com/grower/bladecutter)