Just like all test kits. With the exception, I have found the individual bottles on Amazon for the Fauna Marin NO2/3.
I use FM for NO2/3 (3 bottles)
Red Sea Pro for PO4 (only 2 bottles)
Salifert for Mag (2 bottles of liquid)
API for Cal (2 bottles)
Red Sea Pro for Alk (1 bottle)
That is until I can finish helping getting Hady the data points he needs for the ABC reagents. I have devised how to use them manually to test and get the proper color changes so I can provide how much water, A,B , or C was needed versus a manual test with similar products to get readings. I'm just trying to get more data points right now at different readings to help.