Home II Combo - 5 Stage Reverse Osmosis Water Filter System (100GPD) with 3 Years of Filter Changes Produce 7000 gallons of pure water with this amazing package. Removes 95% - 100% of all bacteria, chemicals, pesticides, pharmaceuticals, etc.. 3 Years of filters included along with a PSI guage and TDS meter. Produces pure water for less than $0.01 per litre. No more buying bottled water and polluting the environment.