This is my first spring with our pool as we moved in last summer in July. We had the pool opened by a pool company and everything was good. It was dirty on the bottom throughout this spring with some leaves, flower petals, dirt, and pollen. We purchased a Dolphin M400 and that helped a lot. We are still getting pollen that seems to settle to the bottom even after using the Dolphin. I'm just guessing there is still a lot floating around. I started to notice some discoloration on the vinyl liner but thought it would go away. It looks like a tan / light brown film. I can't brush it off and I even turned the brush over to use the rubber end to see if it would rub off with something more heavy duty than the brush. It did not though.
Last week the pool went really cloudy after being crystal clear all spring. I added some chemicals recommended by the pool store (phosphate remover and clarifier). I then shocked the pool with 3 bags of 12 oz shock (28,5000 gallons). It cleared up a day or so later. We have still been getting lots of what I believe is pollen on the bottom. But the tan / light brown film still will not go away. I'm afraid that it is algae but don't know how to diagnose it for sure. I thought that if it was algae it would brush off, but it definitely does not.
Also when the pool was cloudy the chlorine was extremely low. After the shock it was very high for a few days and then came down a bit. Now it is starting to get lower again. I'm nervous it will get cloudy again as the chlorine dips. We use Brite Stix chlorine tablets in the 2 skimmers we have (1 in each).
I've been reading this forum for a little while now and I know your opinions are to not do what I am doing with the chemicals. I'm hoping you can still be of some help to get this tan / light brown film / stain diagnosed. Any help would be great.
I have attached some pictures for you to see what it looks like.