Seachem Reef & Marine Water Additives

MULTI-buy

Seachem Reef Fusion 1 & 2 500ml Pack

£20.88

MULTI-buy

Seachem Reef Fusion 1 & 2 2L Pack

£52.00

MULTI-buy

Seachem Reef Pack Fundamentals

£20.39

MULTI-buy

Seachem Reef Advantage Magnesium - 600g

£12.06

MULTI-buy

Seachem Reef Advantage Strontium - 600g

£13.17

MULTI-buy

Seachem Liquid Marine Buffer - 500ml

£13.99

MULTI-buy

Seachem Reef Phytoplankton 250ml

£8.19

MULTI-buy

Seachem Reef Carbonate - 500ml

£9.77

MULTI-buy

Seachem Reef Phytoplankton 500ml

£14.69

MULTI-buy

Seachem Reef Kalkwasser - 500g

£15.99

MULTI-buy

Seachem Reef Strontium - 500ml

£15.49

MULTI-buy

Seachem Reef Advantage Calcium - 500g

£12.95

MULTI-buy

Seachem Reef Advantage Calcium (4KG)

£82.99

MULTI-buy

Seachem Reef Advantage Strontium 70g

£3.70

MULTI-buy

Seachem Reef Advantage Strontium 300g

£7.98

MULTI-buy

Seachem Reef Strontium - 250ml

£7.95

Our Bestsellers

Seachem Reef Advantage Magnesium - 600g

£12.06

Reef Advantage Magnesium is a concentrated (80,000 ppm) optimized blend of magnesium, chloride, and sulfate salts designed to restore depleted levels of magnesium with minimal impact to the ionic ratios found in natural sea water.

Seachem Reef Phytoplankton 500ml

£14.69

Reef Phytoplankton™ is a concentrated blend of green and brown marine phytoplankton designed to provide the essential fatty acids, proteins, vitamins, amino acids, with biological carotenoids for invertebrate diet.

Seachem Reef Advantage Calcium - 500g

£12.95

Reef Advantage Calcium is a non-caustic (pH 8.3–8.6) optimized blend of ionic calcium designed to restore and maintain calcium to levels found in natural seawater.

Seachem Reef Kalkwasser - 500g

£15.99

Reef Kalkwasser is a pure calcium hydroxide with unsurpassed purity and solubility characteristics. Calcium hydroxide is used to prepare limewater (kalkwasser) solutions that will maintain calcium concentrations at natural seawater levels.

Seachem Reef Fusion 1 & 2 2L Pack

£52.00

Reef Fusion 1™ and Reef Fusion 2™ are the foundation of a system formulated to provide the essentials for the reef aquarium. Reef Fusion 1™ provides calcium, while Reef Fusion 2™ provides alkalinity. When used together, the Reef Fusion™ system will maintain calcium and alkalinity levels.

Seachem Reef Fusion 1 & 2 500ml Pack

£20.88

Reef Fusion 1™ and Reef Fusion 2™ are the foundation of a system formulated to provide the essentials for the reef aquarium. Reef Fusion 1™ provides calcium, while Reef Fusion 2™ provides alkalinity. When used together, the Reef Fusion™ system will maintain calcium and alkalinity levels.

Seachem products have been and continue to be based on sound science. They now cover the full spectrum of aquarium requirements in freshwater, seawater, reefs, and ponds. They include buffers, conditioners, filtration media, medications, and test kits. Most of Seachem's products are totally unique and specific to Seachem.

Filter Media

Why our delivery is awesome!

Just a few reasons why Charterhouse are the industry leaders

1 Hour Delivery Slot

We provide a 1 hour delivery slot for all Premium Next Day delivery services. No more waiting in all day.

SMS And Email Notification

Your delivery slot will be text and emailed to you. You can then submit a different day or request the parcel is left with a neighbour.

Weekend Deliveries

We now offer deliveries on both days of the weekend. These services can be selected at checkout.

Free Shipping Over £50

Spend over £50 on your order and qualify for free shipping. Next day and timed services available.

Find out more

Flexible Payment Options

We offer flexible monthly finance options. Credit is subject to application and status.

Find out more

Reward Points

As a thank you, we run the Charterhouse Points scheme. Earn points on every order.

Find out more

Installation & Maintenance

Free Shipping Over £50

Flexible Payment Options

Price Match

Reward Points

Seachem Reef & Marine Water Additives

Our Bestsellers

Reef Advantage Magnesium is a concentrated (80,000 ppm) optimized blend of magnesium, chloride, and sulfate salts designed to restore depleted levels of magnesium with minimal impact to the ionic ratios found in natural sea water.

Reef Phytoplankton™ is a concentrated blend of green and brown marine phytoplankton designed to provide the essential fatty acids, proteins, vitamins, amino acids, with biological carotenoids for invertebrate diet.

Reef Buffer™ is intended primarily for use in a reef system where the maintenance of a pH of 8.3 is often difficult.

Reef Advantage Calcium is a non-caustic (pH 8.3–8.6) optimized blend of ionic calcium designed to restore and maintain calcium to levels found in natural seawater.

Reef Kalkwasser is a pure calcium hydroxide with unsurpassed purity and solubility characteristics. Calcium hydroxide is used to prepare limewater (kalkwasser) solutions that will maintain calcium concentrations at natural seawater levels.

Reef Fusion 1™ and Reef Fusion 2™ are the foundation of a system formulated to provide the essentials for the reef aquarium. Reef Fusion 1™ provides calcium, while Reef Fusion 2™ provides alkalinity. When used together, the Reef Fusion™ system will maintain calcium and alkalinity levels.

Reef Builder raises carbonate alkalinity without immediately impacting on pH. With long term use there will be a tendency to stabilize at pH 8.3. Carbonates and calcium are essential to all coral growth.

Reef Fusion 1™ and Reef Fusion 2™ are the foundation of a system formulated to provide the essentials for the reef aquarium. Reef Fusion 1™ provides calcium, while Reef Fusion 2™ provides alkalinity. When used together, the Reef Fusion™ system will maintain calcium and alkalinity levels.

Why our delivery is awesome!

1 Hour Delivery Slot

SMS And Email Notification

Weekend Deliveries

Free Shipping Over £50

Flexible Payment Options

Reward Points