I have a brand new (still in the box) ES3 Enviroswim system for swimming pools (https://www.enviroswim.co.nz/product/enviroswim-es3-domestic-system/) that I wont be able to use due to cancelled project.  I believe they retail for about 6k but happy to let it go for $4600. I have a spare set of copper electrodes as well which i can sell together for another $200. They retail for around $300 or so.

Shipping would be extra. Will list on trademe at higher price sometime next month if no buyers from GZ.