Fangrui Product Details [material]pool Scrubbing Stones Do Not Absorb Grease And Dirt And Can Be Safely Used On Most Pool Surfaces, Including Tiles, Grout, Concrete And Gunite, For A Long Time. [handheld Pool Pumice]a Clean Pool Is A Happy Pool! Our Pool Tile Cleaner Can Effectively Remove Rust, Mineral Deposits, , Calcium, Stains And Hard Water Deposits On Tiles, Ready For Summer Swimming. [suitable Size]pool Cleaning Pumice Is Suitable For Your Cleaning Needs In Different Places, Saving You Time And Money On Re-purchasing. [easy To Use]handheld Pool Pumice Is Designed With A Handle. Just Wet The Pumice, Then Gently The Pool Cleaning Brick On The Pool, And Then Wipe It Repeatedly To Remove Stains And Marks On Pool Tiles. [wide Application]no Need To Drain The Pool. Our Handheld Pool Pumice Is An Ideal Choice For Pool Tile Stain Cleaner. The Handheld Pool Scrubbing Block Can Not Only Be Used For Pool Wall Cleaning, But Also Can Be Used To Remove Stubborn Dirt On Glass Tiles, Shower Glass Doors, Tiles, Grout, All Sinks And Toile