floating sponge ball things

[Rgut3]

do those floating filter ball things really work like they say, the ones that are in the pool...floating around or tied to the rail....I dont want to waste money on a product that doesnt do its job....tia

 

[Newdude]

They do not. Wait. Which filter ball things? For inside the pool, or inside the filter. Meh. The answer remains the same.