You can add tannin filtration to the UV Dynamics MR320e-TP2S/220 by adding this kit UV Dynamics MR320 Tannin Conversion Kit

You are adding a third pre filter housing before the water flows through the existing two pre filters. The new filter will be the sediment and then you will move the carbon filter to the next in line with the new tannin filter being just before the UV light to remove the tannins and color in the water. Note: this system is sized for a low flow application for a cottage or cabin with one bathroom. This is not meant for a permanent house with several bathrooms. For a high flow application your would need this type of tannin filter https://www.youtube.com/watch?v=F3Cpk...