Hello, I am a relatively new pool owner, approx a year. My pool, which is a little over a year old developed brownish staining over the last 2 months. It was fine prior to that. No idea what it is, tried lots of different methods to remove it, chlorine granules on the spot, vitamin C, some removers from Amazon and nothing seems to work. I did have success using a pumice pool stone testing on a small spot, but would be too much to do the entire pool, couldnt do underwater and not very effective. I tried the heavy scour sponges and nothing. I saw in another thread that someone had success with Jack's magic which I haven't tried yet. This would also require me to put a bypass on my heater if it works. Just trying to get an idea of what this is and how to treat it. I saw mention in another thread that could be dirt encased in calcium. It's just weird that this showed up all of a sudden and my suction cleaner didn't pick it up when it started. My pool guy wants to acid wash which I said should not be needed for a pool that is one year old Attached some pics and any help would be appreciated. Thanks.
