Maryton Pumice Stone for Toilet Bowl Cleaning, Remove Hard Water Rings, Limescale Stains, Calcium Buildup, Iron and Rust, Pumice Stick for Bathtubs, Pool Shower Tiles, Kitchen, , 6 Count. 6 Count (Pack of 1) 352. 200+ bought in past month. $629 ($1.05/Count) $5.98 with Subscribe & Save discount.