Seachem Zeolite 250 ml

• Binds ammonia and heavy metals.
• Highest ammonia binding capacity of any zeolite.
• Removes harmful metal ions like lead, copper, nickel and zinc.
• Marine & Freshwater.

Seachem Zeolite is a naturally occurring, highly-porous mineral that binds ammonia and heavy metals through an ion exchange mechanism. It has the highest ammonia binding capacity of any available zeolite; ten times higher than some products and twice the capacity of the closest competitor. It won’t deplete calcium in saltwater, and it won’t increase general hardness in freshwater, where the ionic strength is low.

Setup & Use

What it is. A naturally occurring, highly porous mineral filtration media that binds ammonia and heavy metals (lead, copper, nickel, zinc) by ion exchange. Seachem states it has the highest ammonia-binding capacity of any zeolite it’s aware of on the market: up to ten times higher than some competing products.

Marine and freshwater both. Unlike most ammonia-removing zeolite, Seachem’s formulation is stated safe for both marine and freshwater use. It won’t deplete calcium in a saltwater tank or raise general hardness in a freshwater one.

Seachem’s own dose. 250 ml (1 cup) per 200 L (50 US gallons) for a standard-size tank; for a small tank, 5 ml (1 level teaspoon) per 4 L (1 US gallon). This dose is rated to remove up to 0.5 mg/L of ammonia, dropping ammonia to zero within 24 to 48 hours.

How it goes in. Rinse before use. Position it so water flows through it freely without tumbling the media against itself: a filter bag, canister filter, or other high-flow spot all work.

Replacing it. For ammonia control, replace once ammonia has dropped to zero, or switch over to activated carbon from there. If it’s being used specifically for heavy-metal removal, Seachem recommends replacing monthly.

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 48 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.