Closed comedones

I started swimming and the water has chlorine and now I am facing pimple and closed comedones

My skincare for oily skin is Roundlab 1025 Dokdu toner Skin1004 poremizing ampoule Cosrx snail mucin BOJ red bean water gel/ Squalene and niacinamide moisturizer

What is causing these problems My skincare or chlorine Do I need to change my skincare