For those bacteria that copper ion can not kill, and all the virus we need oxidization to keep them in check. unlike chlorine, our oxidization only be effective when pool is running.

Pool filter is the dirtiest place in the pool. It hold a lot of "food" for bacteria and virus to multiply. 

Most system is placing the electric chamber after filter, in the return pipe. Therefore the filter never get oxidized or sanitized.

As a result, the filter is likely to hold a lot of bacteria and virus. When pool is running, the filter release its bacteria and virus to the pool. Although some of them are killed when passing oxidizing chamber. There are still high probability that bacteria and virus escaped to the pool.

Our (FreshSetry) Oxidizer is placed at the skimmer. The produced oxidizing agent will pass the pump and the filter . It oxidizes the filter. Filter will be clean.  There would be no blind spot for dirt. Our system will be much cleaner than our competitions.