This mixer is available in two different sizes, 600 and 1000 litres. The mixer system consists of a large tank with mounted submersible pump and a three-way valve for adjusting the mixing or overpumping for the liquid spreader. A liquid scale lets you keep track of liquid levels.
The salt solution you mix should contain between 20% and 22% salt. To check the salt content, place a drop of liquid on the refractometer and then read off the result next to the blue line. This will ensure your salt solution is correct.