@Be102 its a Professor in South Africa that designed it , think he only sells local but can find out .
DSD is plant fertilizer
You get low tech , and the high tech ( more light , co2 )
Low tech is a plant feeding mix and water hardening mix (GH) , 1ml per 10l ( 50% wc weekly )
However , moving to co2, more growth , so more ferts are needed
This includes the same plant and hardening mix ,
KH up - with co2 you need stable kh to balance out ph swings (I used crushed coral in my filters as well, too much c02 , the crushed basically dissolved and raised ph )
perfect KH reading for high tech is 4
You also use 3ml DSD NPK fertilizer x3 a week, if you notice any algae you switch out NPK to NK-P
He designed it for different water ( western cape , northern cape ) meaning the water doesn't have the same additives as other regions , where I stay we have very soft water , GH and KH 0.
If you wanted to see more PM me you email then ill send you the emails with his contact details .
Im only running a pond and a bathtub filled with my 7 year old strain I designed ( still busy ) and a few shrimps
And that is for the hobbyist who say reefing is difficult.
My challenge still stands
I have done freshwater plants till basically 2010 when I dropped it and just continued on the salty side as I thought salt is a lot easier