Pool-Whiz Pumice Block, Pool Tile & Concrete Cleaner, Pumice Stone for Cleaning Pools, Spas & Water Features, Pool & Spa Cleaner, Pumice Block for Rust, Stains Build Up by Billy Buckskin Co. Pack of 1

Got this in the mail and immediately tested it out. Got rid of a ton of calcium buildup in our quartz pool. Will need to buy another, but very happy with this purchase

Works well with a little time and scrubbing. I got the white line off my pool tiles. They do dissolve fast I did get all four sides of pool with 2 but I tried to keep the pumice stone out of the water for the most part.

Worked like a charm to remove hard water lines and dried pollen off smooth tiles that wouldn't budge with a scrub daddy and elbow grease. Slap your knee pads on, get that cushion to kneel on and be sure to limber up prior and during the chore of cleaning your tiles! These were a good size and I almost made it all the way around our entire pool with one. I'd buy again.

It takes a lot of scrubbing but it works . I have glazed tile and tried it on an extra tile and did not scratch. It will probably take 2 or more bricks to finish. This is a new pool too.

I was amazed at how well these worked, removing stubborn scale in the pool with a little elbow grease and some scale removal liquid with good results

Completely useless. I used it to scrub my pool. One block lasted less than 5 minutes until it was only 1/4" thickWaste of money

These Pumice Blocks work Awesome on Pool Tile.

Very good product