- Aquatics
- Aquariums
- Red Sea
- Evolution Aqua
- Innovative Marine
- BiOrb
- Biopod
- D-D Reef Pro
- Juwel Range
- Fluval Aquariums
- Aqua Medic
- Elos
- Medusa 45
- Eheim Aquariums
- Reef Octopus
- Aquael Aquariums
- Clearseal
- Brio 35
- Aqua One
- Red Sea Max
- Newa
- Norrom Aquariums
- Signature by TMC
- Cubic
- SuperFish Aquariums
- Tetra Cascade
- TMC MicroHabitats
- Dennerle
- Ifalos
- Ex-Display
- Filtration
- External Filters
- Internal Filters
- Filter Media and Foam
- Protein Skimmers
- Filtration Units
- Fluidized Reactors
- Reverse Osmosis
- UV Sterilisers
- Auto Top-up
- Algae Reactors
- Acrylic Sumps
- InTank Upgrades
- Flexible Tubing
- Eheim Accessories & Media
- Eheim Spare Parts
- Eheim 2206 Parts
- Eheim 2232 Parts
- Eheim 2208-2212
- Eheim 2234 Parts
- Eheim 2236 Parts
- Eheim 2213 Parts
- Eheim 2215 Parts
- Eheim 2217 Parts
- Eheim 2222/2224
- Eheim 2322/2324
- Eheim 2028 Parts
- Eheim 2026 Parts
- Eheim 2126 Parts
- Eheim 2128 Parts
- Eheim 2227 Parts
- Eheim 2229 Parts
- Eheim 2327 Parts
- Eheim 2329 Parts
- Eheim 2080 Parts
- Eheim 2071-75 Parts
- Eheim 2076-78 Parts
- Eheim Pump Parts
- Ozone
- Nitrate Filters
- PhosBan Reactors
- Kalkwasser Stirrers
- Pumps
- Water Pumps
- Powerheads
- Dosing Pumps
- Air Pumps
- Lighting
- EcoTech Radion
- Aqua Illumination
- Kessil Lighting
- Maxspect LED Lighting
- Fluval LED
- TMC V2iLumenAir
- TMC v2iLumenAir Compact
- TMC V2iLumenAir Nano
- Juwel HeliaLux LED
- Juwel MultiLux
- Aqamai
- S-Series LED Upgrade
- Aqua Medic Lights
- TMC Aquaray
- Universal Hanging Kits
- Juwel NovoLUX LED
- Aquael
- Red Sea Reef Spec
- Euroquatics Angel LED
- Zetlight UFO
- Euroquatics E5
- TMC Horizon
- Arcadia Lighting
- Aqua One
- Sanrise Series LED
- Elos Lighting
- Eheim Lighting
- Wavepoint
- Tunze LED
- Juwel Lighting
- Giesemann Lighting
- D-D T5 Lighting
- Specialist
- Conditioning
- Red Sea Reef Care
- Seachem
- Triton Method
- ATM
- Blue Life
- Fritz
- Aquaforest
- Aquaforest Freshwater
- Coral Essentials
- Vibrant Liquids
- Boyd Enterprises
- Prodibio
- AquaScaper
- Salifert
- Reeflowers
- Nyos
- Seneye Flora
- Kent Marine
- Tropic Marin
- Dr Tims
- Tropica
- Evolution Aqua
- AlgaGen
- JBL ProScape
- Polyplab
- Eheim
- AFM Marine
- Caribsea
- CoralRx Pro
- Coral Protec
- API Products
- Bio Aquatek
- Easy-Life
- Ecosystem
- Brightwell Aquatics
- Fluval SEA
- GroTech
- Hobby
- Aqua Medic
- Interpet
- Joe's Juice
- JBL
- King British
- Kordon
- NT Labs
- Vertex
- Polyfilter
- Rowa
- Tetra
- Two Little Fishies
- Waterlife
- Fauna Marin
- Foods
- Vitalis
- Ocean Nutrition
- Gamma Nutra
- Gamma Freshwater
- Fluval Bug Bites
- Live Foods
- Aquaforest
- Reefbugs
- Frozen Food
- Elos
- Gamma
- EasyReef
- Hikari
- Seachem Nutridiet
- NT Labs Pro-F
- Tetra
- Tropic Marin
- D-D Pro+
- Eheim Foods
- Fluval
- Firstbite Foods
- GroTech
- Polyplab
- Mysis RS Foods
- Two Little Fishies
- TMC Nutrafeed
- Aquarian
- JBL Foods
- King British Food
- Hobby Foods
- Fauna Marin
- D-D Marine Deluxe
- Holiday
- Calanus Foods
- Maintenance
- Marine Salt
- Media Bags
- Test Kits
- Filter Socks and Holders
- Auto Feeders
- Marine Accessories
- Refractometers & Hydrometers
- Cleaning
- Maintenance Box
- Putty Glues & Silicon
- Fittings
- XAqua
- Locline
- Adaptor Unions
- Tank Unions
- Table-Ducts
- Bulkhead Tank Connectors
- PVC Pipes
- 90° Elbow
- 45° Elbow
- End Sets
- 90° Long Bends
- 45° Long Bends
- S Bends
- Ball Valves
- Gate Valves
- Compact Ball Valves
- Hose Nozzles
- 90° T-Piece
- 45° T-Pieces
- Reducing T-Piece
- Female Adaptor Sockets
- Male Adaptor Sockets
- Sockets
- Reducing Sockets
- Reducers
- Non Return Valve Strainers
- Tube Clips
- Non Return Valves Double Union
- Round Grates
- Non Return Valves Single Union
- Regulation Valve
- Outlet Strainers
- Overflow Combs
- Caps
- Metric to Imperial Coupler
- Glues and Cleaners
- Eazy Connectors
- Ultra-Reef
- Random Flow Generator
- Decoration
- Accessories
- Heaters
- Red Sea Tank Covers
- D-D JumpGuard
- DIY Aquarium Cover
- Coral Colour Lens
- Water Change Kits
- HopStop
- Gift Vouchers
- Feeding Accessories
- Power Bars
- Reef-Cam
- Tools
- Water Containers
- Acclimation Kits
- Thermometers
- Aquascaping Accessories
- Fish and Pest Traps
- Tank Dividers
- Breeding Boxes
- Egg Crate
- Magazines
- Reef Keeping Hampers
- Spare Parts
- Aquariums
- Livestock
- Ponds
- Exotics
- Services
0
Seachem Reef & Marine Water Additives
Discounts Bundle
Our Bestsellers
Seachem Reef Advantage Magnesium - 600g
£11.56
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.
In Stock
Seachem Reef Buffer - 500G
£21.24
Reef Buffer™ is intended primarily for use in a reef system where the maintenance of a pH of 8.3 is often difficult.
In Stock
Seachem Reef Advantage Calcium - 500g
£17.45
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.
In Stock
Seachem Reef Builder - 600g
£18.28
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.
In Stock
Seachem Reef Fusion 1 & 2 2L Pack
£59.95
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.
3-4 days
Seachem Reef Iodide - 500ml
£16.95
Reef Iodide is a concentrated (8,000 mg/L) stabilized potassium iodide source for reef aquaria that will restore and maintain iodide levels to those found in natural sea water
In Stock
Seachem Reef Fusion 1 & 2 500ml Pack
£26.95
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.
In Stock
Seachem Reef Plus - 500ml
£16.99
Reef Plus is a full spectrum reef supplement containing trace elements, vitamins, and amino acids demonstrated to have a positive impact on the growth of corals and other desirable reef creatures.
In Stock
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 MediaWhy 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 morePay by Finance
We offer flexible monthly finance options. Credit is subject to application and status.
Find out moreReward Points
As a thank you, we run the Charterhouse Points scheme. Earn points on every order.
Find out more