Grout sponges are made in approximate sizes for the given industries. For purposes of selling bulk grout sponges, they must be compressed. Once the grout sponges are compressed they are wrapped and boxed to fit packaging.
Compressed sponges can take up to 72 hours to restore to the original approximate size in temperatures above 70 degrees Fahrenheit once removed from packaging. Cooler temperatures will retard the grout sponge's restoration and will take longer to restore to the original size before compression.
If you can't wait for the grout sponge to reach the original approximate size before compression just adds the sponge to water. If you submerge the grout sponge in water the grout sponge will restore its self to the original approximate size in minutes.
We recommend you remove all grout sponges from packaging when you receive your order so air can restore their original size. Grout sponges can be stored in large drums or large garbage bags with the end open for air.