Product Overview

The U.S. Pumice Pool Blok Large Pumice Stone (PB-12) is a natural scrubbing stone for lifting the build-up that chemicals leave behind. Rub it over waterline tile, grout or concrete and its gentle abrasive action wears away lime scale, rust marks, mineral stains and algae deposits. Because it's chemically neutral, it won't change your pool's pH, and you can use it right away with the pool full. No gloves, applicators or mixing needed.

⚠️ Important Purchase Notice

This listing is for one pumice stone. Pumice is abrasive: use it only on ceramic tile and concrete-type surfaces, and do not use it on vinyl liners, acrylic, fiberglass, wood or chrome. Always test a small, out-of-sight area first. Inspect the shipment upon arrival and report any damage promptly.

Ideal For

• Cleaning scale and stains off waterline tile.
• Spot-cleaning concrete, plaster and gunite pools and spas.
• Pool owners and service techs who want a chemical-free cleaning tool.

Key Features

• Large natural pumice stone.
• Removes lime, rust, stains and algae deposits.
• Chemically neutral; won't upset pH balance.
• Works with the pool full; no draining required.
• Ready to use; no gloves or applicators needed.

Benefits

• Handles stubborn deposits that chemical cleaners can't remove.
• Wears to the shape of the surface as you scrub, reaching corners and grout lines.
• No chemicals added to the water, so no rebalancing afterward.
• Low-cost tool that's easy to keep with your pool supplies.

Compatibility

For ceramic tile and molded or pneumatically applied concrete (gunite/shotcrete) pools and spas, including plaster finishes. Not for vinyl, acrylic, fiberglass, wood or chrome surfaces.

Installation or Upgrade Context

Wet the stone, then rub it back and forth over the stained area with light, even pressure, letting the stone do the work. Rinse the stone and surface as you go and check your progress often. The stone wears down with use; replace it when it becomes too small to grip comfortably.

What’s Included

• One U.S. Pumice Pool Blok large pumice stone.

Specifications

Customer Q&A

Do I need to drain my pool to use it?

No. It works underwater or at the waterline with the pool full.

Will it scratch my pool?

It's made for ceramic tile and concrete-type surfaces. Don't use it on vinyl, acrylic, fiberglass, wood or chrome, and test a small hidden spot first.

Will it affect my water chemistry?

No. Pumice is chemically neutral and won't change pH.