20 inch 7 stage filter system with one particulate filter and one 6 stage filter. The six stage filter provides two 1 micron filters, ion water softner stage, KDF55,KDF85, and a carbon filter. The large 20 inch filter provide extended filter capacity for whole house applications. The system can be modified to suite the application through the use of various other filters to treat sulfur water, taste, hard water, or other significant water problems.