Now that we know what Biofilms in a swimming pool are, we've got to get rid of them! And since they're very difficult to kill, we've got to remove them and prevent their regrowth.
Biofilms can be treated, removed and prevented. There are 2 Ways to remove biofilms: Mechanically and Chemically. Just as you brush your teeth & use toothpaste and mouthwash to remove, treat & prevent biofilms on your teeth and in your mouth, you need to perform similar routines with your swimming pool.
Mechanically. Biofilms can be removed physically (mechanically) by brushing, wiping and vacuuming. In cases of heavy biofilm that have "become" Whiter Water Mold or Pink Slime, I would strongly recommend that you consider throwing out the pad or brush if the pad or brush itself cannot be thoroughly cleaned.