Which mixer is the best?
The most important part of the mixer is the mechanism that produces a stream of water that dissolve the chemicals. In the simplest terms, it is a tube with holes drilled into it. Those with directed nozzles are not much better. You should also avoid buying side mixers without a bottle washer.
The best mixers have special swirler which, when installed at the bottom of the mixer, generate strong water stream which is suitable for the effective and quick dissolution of powders. An important element of the higher-class mixers is its own pressure regulator, which allows you to select the optimal pressure of water directed at the swirler. Top-shelf mixers, in addition to the swirler and pressure regulator, have a multi-way ball valve that allows you to conveniently perform all dissolving operations with one valve.