[waterfilters]

The PuROTwist 4000 system is an easy to use RO system. The replacement filters and replacement membrane are easy to change. You simply unscrew them and screw in the new filters. This is one of our most popular RO systems. If the below link does not work, you may enter PuROTwist 4000 in the Search box in the upper right hand corner, and the link will be the first one in the list.
http://www.waterfilters.net/Good-Water-Warehouse/Reverse-Osmosis/systems/PuROTwist-4000.htm


If you do not have enough room for an RO system, you can consider an RV-EZ-4 drinking water system. The system is more compact and fits under the sink. The filtration is not as good as an RO system because there is no RO membrane to reduce dissolved solids. But, this system does reduce a lot of contaminants that most systems do not reduce.
http://www.waterfilters.net/Culligan-RV-EZ-4-RV-Water-Filter-System_p_0-437.html