Pure Nature Pets Poseidon Filter Rocks, 5-Pound

5 total pounds, approximately 25 total Zeolite Rocks. Poseidon Filter Rocks are designed for passive water filtration for ammonia alongside mechanical filters.
Poseidon filter rocks and made from ammonia capturing zeolite to reduce ammonia levels in aquariums and ponds
Enhances the startup and helps maintain biological filtration by providing a growth medium
100% natural Clinoptilolite zeolite
Organic & all-natural; processed and produced in the USA
2″ – 4″ in size, roughly 25 pieces per package