I'm learning the simple way of the TFP. What takes out oils from the water? The kids wear sunscreen, etc. I suspect the DE Filter takes out some? I notice an oil ring forming in the skimmer basket holder. It's not bad, but it just makes me think about what kind of ring is forming on the dark pool tiles. What do you use to make the tiles shiny again? Is there a legitimate pool store chemical to knock the oils off the top of the water?