I got the GoPro 11, and I had the polarpro red/magenta filters that are sold on the official GoPro website, but I sold them for three reason:
-The newer GoPro have a better auto white balance, and I did some test, where I was continuosly filming, where I could just see that the before and after insertion of the filter, was almost identical, because the camera would compensate it, rending it almost useless if not worsening the image by adding too much red.
-I found out that by applying a fast filter on the Quick app, or by editing in post, I would get better result without filters.
-If you use decent light, don't use filter, if you don't like a red world
By not using filter, I was also able to use the INON wet lens, the UFL-G140 SD and UCL-G165 SD, wich improve by a lot the quality of the footage, and permitting me to go up to 4 cm from subject, instead of the minimum of 60 that have the GoPro without lens.
I Put here two examples, the first while I was using filter 2 years ago in the Philippines, and the second this year at raja ampat with the 140 wide lens.
In both you can see my still shit editing skill, but concentrate on the image quality 😬
Philippines + filters:
Raja ampat + UFL-G140: