Grain size:2.5-3.5 mm

Benefits of Nature’s Ocean® Reef Substrates:
•Ideal for reef system tank bottoms
•Denitrifying anaerobic beds
•Extremely high surface area filter media
•Increases Carbonate Hardness
•Reduces Nitrates
•100 % From The Ocean Floor
•Maintain pH
•Provide Marine Trace Elements
•Heat Sterilized
•Ideal for culturing Live sand

Recommended:
Use at a rate of 10lbs per square foot of the tank floor’s bottom area which yields about a 1″ deep covering. Depending on your needs or preferences the depth may vary from 1/8″ to 3″s of covering.

Freshness & Storage

Every batch we dispatch carries a minimum of 6 months’ remaining shelf life. Store this product in a cool, dry place away from direct sunlight, with the cap or inner foil closed tightly after each use.

Filter media and substrates carry no manufacturing or expiry date — their working life begins on first contact with water, not on the shelf.

Returns & Replacement

Returns are accepted within 7 days of delivery, provided the item is unused and in its original packaging. Manufacturer-sealed items cannot be returned once the seal is broken, and sale-priced items are not refundable.

If your item arrives defective or damaged, message us on WhatsApp with your order number — or email us, if you would rather — and we will replace it. Approved replacements are delivered within 3 to 5 business days. Transit damage is covered by insurance on every shipment. If tracking shows delivered but nothing reached you, tell us within 72 hours, which is the reporting window Indian couriers allow. Damage caused during installation or use is not covered; replacement spares for such cases are chargeable.

Full terms are on our Cancellation & Returns page.