This is not a DIY article. I'm just going to show some images of a Nilsen reactor, its motor, and its magnet assembly. I may put together an article some time in the future. I'm thinking about building a new reactor for myself and I could take some good assembly photos. I built a batch of these reactors a while ago, I over promised, and ended up with an older version for myself.

The only very significant difference between the older version (shown) and the final version (not shown) is the PVC that the valves are attached to. The PVC fittings were used to easily and inexpensively experiment and adjust the internal tube configurations via ½" PVC pipe. I found that the internal tubes did not do much so I removed them. Some people may feel more at ease by putting a tube on the input so that any newly added water is added through the settled Ca(OH)2.

The motor assembly is made using nylon spacers, aluminum bar stock, and some machine screws.

The magnet assembly consists of two (2) ceramic magnets from www.indigo.com product # 33499-251. The magnets used in the project have one pole per face. They are aligned such that one magnet is north up and the other magnet is south up. Also, they are mounted on a steel ground pole. The ceramic magnets must be mounted on a steel ground pole. I used ground tool steel because it had nice specs.