I use a magnetic stir plate to make very concentrated solutions. I find mixing this way dissolves the solution better and I get the results I want. Below are some links to some stir plates (mine mixes up to 3.5 liters of water), the magnetic stir bar, and master hydroponics. The app name is “MB HydroCalc” and I use this on Android.
Magnetic Stir plate https://amzn.to/2OpUz0n
Magnetic Stir bar https://amzn.to/30eiYZg
Masterblend Fertilizer https://amzn.to/30iBGPy
MaxiGrow & Maxi Bloom mix https://amzn.to/3rnyAFU
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Mike & Anna