YJ: Thanks guys, l am so thrilled and get your comments.
Any comments on the particular trademe list ($810) versus the water guard one ($1430 or $ 1880?)
I would question if the water is going to be travelling too fast through the UV, and would also find out how much a replacement bulb costs.
I built my home system using these http://www.trademe.co.nz/business-farming-industry/farming-forestry/irrigation-drainage/other/auction-1011693148.htm as I did not have the space for the 20 inch model.