Yup, that's Calcium Nitrate. Probably got more N in it then your A bottle.
@Mañ'O'Green wanted in aisle six. What do you think brother? With 7.5ppm of Magnesium and 55.5ppm of Calcium in the starting water...I would skip the calmag all together for a while...and see how the plants respond.
It's called Magnesium sulfate. It costs near to nothing and only got Magnesium in it. Ok, also Sulfer, but that amount can be ignored as it's so small. The only problem is finding a good source of Calcium...Let me think...Oh, your tapwater already has 55ppm of it in it. Just need to figure out if that's enough. Think MOG will know that. Wait...According to MegaCrop you need about 138ppm in Veg, so your tapwater already delivers more then 1/3.Next question then is.. low N calmag supplements available in the UK?? Any recommendations??
Then we just need to find out what's inside those A & B bottles and we can start to calculate a dosage...Mhmmm, interesting and fun
Let me take 5 and roll me a fatty. See you guys in a...