I received several question regarding what/how I mix in my solutions. Here are the recipes for 2017:
Estimative Index (extra P) macro solution:
In 1 L bottle I add :
130g KNO3 ; 23g KH2PO4 ; 59 K2SO4 ; 1L RO water*
5ml in 100L result in
4ppm NO3–; 0.8ppm PO43-; 4.17ppm K+
In 1L bottle I add:
33g CaSO4*2H2O ; 28g MgSO4*7H2O ; up to 1L RO water*
4ml in 100L results in
0.3ppm Ca2+ and 0.11ppm Mg2+
Source: GH Booster (barrreport.com)
*I measure the substance individually and mix them in a gradated vessel. After everything is in, I boil RO water and let it cool a little bit until comfortable to touch. This increased temperature helps dissolve the salts. I add this water up to the 1L mark and mix well. Then pour in a clean bottle and store in a cool dark place.
These are my solutions for this period, as you may notice they differ from what is given in the sources. I may modify them again if I consider it would improve the results in the display aquariums. I find that K is enough from EI without adding it to the GH booster. Conversely I find my plants do better with more PO43- then generally recommended by EI. How much to dose and how frequent is a discussion for another time.