Research on adsorption capacity of iron and arsenic in the groundwater by biophin filter with other filter matcrials, include: gravel, quartz sand, activated carbon is really essential. System working in test mode filter for 5 days then replaces layers with different filter materials. Results showed that, biophin filters capable of handling groundwater containing iron and arsenic. Processing performance iron and arsenic varies follow formula different filter materials, sort them trom low to high as follows: Quartz sand + gravel Activated Carbon + Quartz sand Gravel + Activated carbon + Quartz sand. In particular processor performance iron and arsenic in groundwater by gravel + Activated Carbon + Quartz sand is highest (98 percent processing iron, arsenic removal of 93 percent).