How to keep scum out of a 12 feet pool?

Question

How to keep scum out of a 12 feet pool?

Answer 1

Put up a fence. You do mean neighbors right?

Answer 2

purchase a long net and skim the water and make sure the chemical balance is correct

Answer 3

The "scum" is probably dirt from peoples feet when they enter the pool. Get a large container and fill it with water to "rinse off" feet before entering the pool.