Under counter Water Filters

Can you tell me what the difference is between your under counter water filter and a 5 stage reverse osmosis system? I am looking to remove fluoride from my water.Can you also send me a list of the specific contaminants/chemicals that your system removes and the percentage of removal?
Also, does your system require a storage tank? If not, why not?

This is a good link which educates you on the difference in water treatment technologies: http://doultonusa.com/HTML%20pages/water_treatment_technologies.htm.
For fluoride removal you will need a Doulton 200 series under counter filter, IP200UC+. It does not require a storage tank because (unlike R.O.) it produces water on demand at a steady 1/2 gallon per minute. R.O. requires storage tank because it wastes 3-4 gallons for every gallon of water it produces. The 200 series filter will contain 2 cartridges within. The specs for these cartridges are on the links: http://doultonusa.com/ultracarb_imperial_cartridge.pdf (Ultracarb ceramic candle) and http://doultonusa.com/Inorganic%20elements%20specs/A-2_Element.pdf (fluoride specific candle).