Dirty pool

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I have a large swimming pool in my garden. I have had the water in for almost 4 weeks. I have managed to keep it clean chlorine leeks are fine. But there's some sort of see through scum on top. Which was not there till today. Its not cloudy. Its all clear and clear apart from the vert thin layer on top. Can't bet it out either. Any ideas. Have included pic of pool.

Suncream? Ours gets a film on it if someone is covered in cream. Just keep on with your usual routine of filtering and chlorinating

Where does the water go when you empty the pool?

we used to have a paddling pool that wee empty on tor the grass and that was enough

When I do empty it. It will go down the drain.

Sun cream or other skin cream probably

I think I will throw in some white sponge things and shoke the pool.