The micro irrigation systems have been widely used around the world for crop production. The main disadvantage of micro irrigation is emitter clogging, especially when using canal water with soil born suspended particles. In order to alleviate this problem, the media filters are introduced to reduce the suspended soil particles1 which cause the emitter clogging. The gravel filter capability to remove the suspended soil particles ¡s called removal efficiency. Removal efficiency is calculated in accordance with the recommended equation of the American Society o? Agriculture Engineering (ASAE). The removal efficiency of the gravel media fitter mainly depends on the concentration of the suspended soil particles ¡n irrigation water before and after filtration. (t ¡s a unique character of the gravel media used, where, gravel media size and shape are the most important factors. Laser transmission technique s used to determine the removal efficiency of different gravel media types (sizes), gravel depth and suspended soil particles concentration. Such measurements were carried out using He-Ne laser (632.8 nm). Comparison between the conventiona method (oven drying) and the laser transmission technique for determining filter removal efficiency was performed. The results show that the values obtained via laser transmission technique ¡s very close to that of the conventional method. However, the laser technique can be easily applied ¡n the field (in situ measurements).