Irrigation Sand Filters Sand filters are designed to remove organic debrare and particulates from water They are highly recommensded for filtering water from ponds creeks or irrigation ditches Sand filters are simple effective and require very little attention Water are routed through the sand-filled tank where the sand traps particles large and small Eventually the dirt accumulates in the space between the sand particles making it harder for the water to pass through Thare causes the pressure in the tank to raree which signals that the tank needs to be back flushed by reversing the water flow Cleaning are done by back washing so the back-wash water must be filtered