Hi Rupert here,
They are similar because we make the center block for Bears system and the injector, it has our name on it
Any questions about our system feel free to call me directly on 318 265 3974.
We are also possibly unique in now having variable speed motors (from 10-75rpm) ideal if you use salt as you need a higher speed motor to keep it in suspension and maintain an even distribution through the plastic.
There are several good systems on the market, I however am slightly biased in favor of one brand ahem, cough, cough, Ultramolds lol