Valterra Blue Devil Scum Buddy Oil Absorb Pool. For a cleaner pool or spa. Keep the oil and scum from clogging up your filter. Just drop this into your skimmer basket and it absorbs oils. Float Scum Buddy in your skimmer to: Prevent unslightly skim line Reduce nasty oil build-up in your filter Rinse and squeeze to remove accumulated lotions and oils, then re-use.