Hope this late reply is still useful to you. The first thing to note is that the image on this web page and the heading "Complete System" are completely misleading. The R830 product is ONLY the UV disinfection unit. Therefore, and as others have noted here, it does nothing to remove undesired chemicals. You can look up the Rainfresh website to find out the specs on other components that may do what you need.
With regard to capacity, my system has two sediment filters (coarse and fine) and the UV unit, and it has no trouble serving my 2100 sq ft house with 2.5 baths and usually at least 2 people present. I'm not sure what happens to the flow rate if you start adding other components that you will need (like a carbon filter). Again, the detailed info on the Rainfresh website is reasonably good at telling you this. They will also answer email questions. Partly it depends on your water pressure too, I think, which might be an issue at a cabin.
Date published: 2018-09-01