CAENBOO Sport Camera Color Filters Waterproof Outdoor Glass Underwater Diving For Gopro Hero 2018/6/5 Black Go pro Hero5/Hero6 - AliExpress Consumer Electronics
NiteScuba Camera Lens 67mm 52mm Circular Polarizer Camera Thread Red Filter Color Light Remedy Underwater Diving Housing Mount|Camera Filters| - AliExpress
Fluval U3 Underwater Filter - Walmart.com
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Hero 5 Red Filter Correction Snap-On Underwater Cam Lens for Photography | Shopee Malaysia
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Fluval U4 Underwater Filter, up to 65 US Gal (240 L)