FLIP9 One Filter Kit for GoPro HERO 11/10/9/8/7/6/5
Amazon.com : CamKix Diving Lens Filter Kit Compatible with GoPro Hero 4, Hero+, Hero and 3+ - fits Standard Waterproof Housing - Enhances Colors for Underwater Video and Photography - Includes 5 Filters : Electronics
SOONSUN 3-Pack Dive Filter for GoPro Hero 8 9 10 11 12 Black Official Waterproof Housing Case - Red, Light Red, Magenta Filters -Enhances Colors for Various Underwater Video and Photography Conditions : Amazon.com.au: Electronics
When to Use GoPro Filters Underwater - Underwater Photography Guide
Filming Underwater with a Go Pro | Go Pro Shooting Similan