Sugar sized sand. The average size of small grains is 0.1 mm. The average large grain size is 1.0 mm. Soft Belly and sifter safe.
Rinse the substrate until the rinse water turns from milky to cloudy, you will not be able to rinse to clear but the tank will clear up once filtration and circulation are running.
TIP: Rather than rinsing in a bucket, one of the corners may be cut out of the bag and a hose inserted. The water will be directed all through the substrate and will run back out the hole.
