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The 55 mm URPRO Green (GR) filter utilizes URPRO’s patented color-correcting technology. This filter is ideally suited for fresh or salt water that is green in appearance due to a high abundance of algae in the water. The coastal waters of California are an excellent candidate for the GR filter. All URPRO filters sold by SRP feature an ultra low-profile filter ring in order to limit mechanical vignetting.