I was thinking of doing this. Is it hard to dissolve and can you use well water with say 200 ppm range to dissolve it in?I ended up putting a pound of MC (454 G) into 1 quart of water.
I use 30ml of that and check the TDS to get where i need to be. That brings me in at 700 TDS I add more as needed
For the ones later in flower back off the amount of solution and add a couple grams of Bud Explosion
Water always ends up at 5.7 after i add that.