I think there only two things you can do about that sort of film:

1. Don't allow swimmers in the pool, unless they've showered with soap immediately before entering, OR

2. Get a 'real' skimmer, like this one: Intex Krystal Clear Wall-Mounted Pool Surface Skimmer Note that this skimmer only fits SOME Intex pools, and I can't find it on the Intex website, so you'd better call them, before you buy.

Please note that ONLY #1 will eliminate the film; #2 will merely reduce it. I've seen this on commercial pools, any time they have quite a few swimmers. It's worse in June, when everyone is covered in lotion, than in August, when most people at the pool are tan.