Substrates
Naturally Sourced Sand, Stones, Mud, and Seawater from the Gulf of Maine
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Filtered Seawater – Authentic Gulf of Maine Marine Water
Every gallon of our filtered seawater is hand-collected from the pristine coastal waters of Cobscook Bay (Pembroke, ME) and Passamaquoddy Bay (Eastport, ME), where the nutrient-rich tides of the Gulf of Maine provide a clean and balanced marine ecosystem. Gathered fresh by our family business, Gulf of Maine, Inc., and shipped directly to your door, this is real ocean water — not a synthetic mix. It contains the natural minerals, trace elements, and organic chemistry essential for maintaining healthy marine life.
Our seawater is available in five different filtration levels to suit your exact needs — from natural plankton-rich water for aquariums to ultra-filtered water for research and laboratory use. Each order is freshly gathered and processed to preserve the integrity of Maine’s coastal environment.
Filtration Levels:
100 Micron (Coarse): Removes large debris while retaining plankton and algae — perfect for touch tanks and feeding displays.
50 Micron (Standard): Clearer water that maintains nutrients — ideal for reef tanks and balanced aquariums.
20 Micron (Fine): Clean yet nutrient-rich — excellent for coral systems and general saltwater use.
5 Micron (Extra Fine): Highly clarified, removes most plankton and algae — best for classrooms, labs, and sensitive systems.
1 Micron (Ultra): Nearly sterile seawater — stripped of microorganisms for aquaculture, research, and controlled environments.
Key Facts:
Common name: Sea water of the Atlantic Ocean
Scientific name:Saltus waterous (just kidding!)
Locations: Cobscook Bay (Pembroke, ME) and Passamaquoddy Bay (Eastport, ME)
Seasonality: Billions of gallons available all year
Colors: Crystal-clear, bright, and blue
Size: Sold in 1- or 5-gallon quantities
Collected: By scooping motion or dipping
Quantity: By the gallon
Note: This is a natural marine product. Slight variations in salinity, clarity, and color may occur depending on tide and weather.
Marine Silt, Sand, and Mud
Collected from Active Gulf of Maine Mudflats
Authentic marine silt, sand, and mud collected by hand from the intertidal mudflats of the Gulf of Maine. This natural substrate contains native microorganisms, organic material, and fine sediment textures representative of real coastal marine environments. Ideal for marine biology labs, aquarium setup, sediment analysis, and benthic ecology studies, this material provides a true-to-nature base for marine tanks and classroom research.
Each collection is gathered fresh to order, ensuring a clean and authentic representation of Gulf of Maine substrate — rich in both texture and ecological value.
Common name: Silt / Sand / Mud
Locations: Marine mudflats
Seasonality: Available all year
Colors: Tan to brown
Size: Available in 1-gallon or 5-gallon quantities
Collected: By hand
Quantity: Sold by the gallon
Uses: Perfect for aquarium base material, sediment ecology demonstrations, or coastal habitat education.
Note: This is a natural marine material. Texture, composition, and coloration may vary by location and season.
Atlantic Ocean Seawater- Freshly collected
Unfiltered seawater straight from the Gulf of Maine — collected and shipped the same day for maximum vitality. Each batch is hand-scooped from the pristine coastal waters of Cobscook Bay (Pembroke, ME) and Passamaquoddy Bay (Eastport, ME), ensuring you receive authentic ocean water rich in natural minerals, trace elements, plankton, and algae. This genuine marine saltwater provides the perfect foundation for aquariums, touch tanks, and marine life studies, replicating the natural environment found along Maine’s rocky coast.
Unlike synthetic salt mixes, our seawater contains live microorganisms and nutrients that promote biological balance and long-term tank health. Each order is gathered fresh by our family business, Gulf of Maine, Inc., and shipped directly to your door — no additives, no filtration, just real ocean water for your aquarium or educational use.
Key Facts:
Common name: Sea water of the Atlantic Ocean
Scientific name: Saltus waterous (just kidding!)
Locations: Cobscook Bay (Pembroke, ME) and Passamaquoddy Bay (Eastport, ME)
Seasonality: Billions of gallons available all year
Colors: Crystal-clear, bright, and blue
Size: Sold in 1- or 5-gallon quantities
Collected: By scooping motion or dipping
Quantity: By the gallon
Note: This is a natural marine product. Natural variations in salinity, clarity, and color may occur depending on tide and weather conditions.
Fine Sand – Natural Marine Substrate
Our Fine Sand is hand-collected from select coastal locations along the shores of Maine. Naturally tumbled and sifted by the tides, this smooth, tan marine sand is ideal for aquariums, touch tanks, classroom tidepool displays, and marine studies. Its fine texture and natural mineral composition provide an authentic substrate for invertebrates, seaweeds, and small coastal organisms. Each batch is sustainably gathered, rinsed, and ready for live marine or educational use.
Key Facts:
Common name: Fine sand
Locations: Found in irregular locations along local Maine shores
Seasonality: Available all year
Colors: Tan
Size: Sold in 1- or 5-gallon quantities
Collected: By hand
Quantity: By the gallon
Note: This is a natural marine product. Natural variations in texture, color, and grain size from photos should be expected.
Cobbly Seabed Stones
These naturally tumbled seabed stones are hand-collected from the rugged shores of Cobscook Bay in Pembroke, Maine, and Passamaquoddy Bay near Eastport. Shaped by powerful tides and shifting sands, each stone carries the texture and color of Maine’s unique coastal geology. The mix includes granite, limestone, basalt, and quartz—creating a blend of pinks, grays, browns, and reds that reflect the diversity of our Downeast shoreline. Ideal for aquariums, terrariums, coastal crafts, or educational geology collections, these authentic marine stones bring the spirit of the Gulf of Maine into your home or classroom.
Key Facts:
Common name: Cobbly seabed stones
Locations: Shores of Cobscook Bay (Pembroke, ME) and Passamaquoddy Bay (Eastport, ME)
Seasonality: Available all year
Colors: Pink, gray, brown, red (granite, limestone, basalt, quartz)
Size: Sold by the gallon (stones range ~¼” – 4”)
Collected: By hand
Quantity: By the gallon
Note: This is a natural marine product. Natural variations in size, color, and appearance from photos should be expected.
Keep your litter box naturally cleaner with Sea Kitty Cat Litter. Designed for dependable clumping and moisture control and easy daily maintenance, Sea Kitty provides a comfortable texture for paws and a cleaner pour with low dust. Its naturally effective formula helps reduce ammonia smells and supports a healthier litter box routine—without harsh additives.
Whether you have one cat or a multi-cat household, Sea Kitty is built for reliable performance, easy scooping, and a better experience for both pets and people.
Key Features
Naturally effective odor control
Low-dust pour for cleaner use
Easy to scoop for simple daily maintenance
Comfortable under paws
Great for single- and multi-cat homes
Sizes: Available in 5lb, 10lb, & 20lb bags
Directions
Fill a clean litter box with 2–3 inches of Sea Kitty Cat Litter.
Scoop waste daily and dispose properly.
Top off as needed to maintain depth.
Empty and refresh the entire box regularly for best odor control.
Fractured Shale Stone
These naturally fractured shale stones are hand-collected from the tidal shores of Cobscook Bay in Pembroke, Maine, and Passamaquoddy Bay near Eastport. Shaped by centuries of tidal action, these smooth, layered gray stones showcase the geological history of Maine’s rugged coast. Their fine texture and natural cleavage make them ideal for aquariums, terrariums, educational geology kits, and coastal craft projects. Sustainably gathered and rinsed to remove excess sediment, each collection offers a unique glimpse into the dynamic processes that shape our intertidal environments.
Key Facts:
Common name: Fractured shale stone
Locations: Shores of Cobscook Bay (Pembroke, ME) and Passamaquoddy Bay (Eastport, ME)
Seasonality: Available all year
Colors: Gray
Size: Sold in 1- or 5-gallon quantities (stones range ~¼” – 4”)
Collected: By hand
Quantity: By the gallon
Note: This is a natural marine product. Natural variations in size, shape, and color from photos should be expected.