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Established 1989
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King British Algae Control

Code: 12263
  • £4.65
Item out of Stock   |   Usually dispatched within 24 hours

An easy-to-use, natural product containing friendly micro-organisms to control filamentous algae, including blanket weed, and green water. Suitable for cold water, tropical and marine aquariums.


King British Algae Control is a natural, easy-to-use water treatment to control algae growth in coldwater, tropical and marine aquariums. Algae growth is not only unsightly, but it can be lethal to fish as it drastically lowers oxygen levels in the water.

King British Algae Control contains friendly micro-organisms, which are cultivated on barley straw. It controls filamentous algae, including blanket weed, and green water in your fish tank.

Captive fish live in a completely closed environment and are entirely dependent on their surrounding water. This means they are reliant on us to maintain their water quality at a suitable level for them to be able to live healthy, happy lives.


When to use King British Algae Control:

• If green filaments of algae are visible in the aquarium

• If a green haze is visible on aquatic plants, ornaments or the aquarium glass

• Once every 14 days to control algal growth

Suitable for use in cold water, tropical and marine aquariums.

How to use


Initial treatment: Use 5ml of King British Algae Control per 9 litres of water

Maintenance treatment: Use 2ml of King British Algae Control per 9 litres of water once every 14 days

1. Calculate the size of your aquarium. If you are unsure how to do this then please follow the instructions below.

2. Shake the bottle well before use.

3. Using the pipette provided, which dispenses 1ml, or the cap of the bottle which holds 4ml, measure the required amount of King British Algae Control.

4. Dispense the treatment directly into the aquarium water.

5. Continue water filtration during treatment.

To ensure the water in your aquarium remains free from algae we recommend carrying out a 10% water change and using King British Algae Control every 14 days.

Formulas to calculate the volume of water in your aquarium

Square and rectangular aquariums: Average Length (cm) x Average Width (cm) x Average Height (cm) ÷ 1000 = Volume (L)

Circular aquariums: Surface Area (cm²) x Average Depth (cm) ÷ 1000

If you are unsure what the surface area of your circular aquarium is you will need to calculate this using (R² x π) or by using the following steps. 

1. Measure the radius of your aquarium. This is the centre of the aquarium to the edge. The easiest way to do this is to measure across the entire length of your aquarium across the middle and divide by 2: Length (cm) ÷ 2 = Radius (cm)

2. Then, multiply the answer by itself: Radius x Radius (or R²)

3. Next, multiply the new answer by 3.14 (or R² x π) = Surface Area (cm²)

4. You are now ready to calculate the volume of water in your aquarium

5. Multiply the new answer by the average depth of your aquarium: Surface Area (cm²) x Average Depth ÷ 1000 = Volume (L)


Alternatively, consult the manufacturer's packaging or if you are filling the aquarium for the first time, you can measure the water as it is added.

Health & Safety


Store in a cool, dry place out of direct sunlight. Do not freeze. Store in the original packaging with the bottle tightly closed. Keep away from food and drink, including animal feeding stuffs. Once empty, dispose of the packaging and the bottle in the household rubbish.

Contact us with any questions you have about this product

Payment Methods

We accept all major Credit and Debit cards, and these are processed via a third party payment gateway called Opayo. 

We also accept payments via PayPal, PayPal credit, Clearpay and Klarna which are both pay in 4 interest-free instalments. 

Also, you can pay using Android and Apple Pay if you are using a compatible device. 

Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.


When speaking to one of our team, we will never ask you for your bank details, passwords or any private information. We will only ever ask for your order number followed by either your postcode, email address or phone number to verify we are talking to the person named on the account. 

When creating an account on our website, we ask that you use a unique password, this will help keep all your online accounts safe. If you are visiting our website via a smartphone we suggest you use the strong password and store it securely on your phone. 

Our website is run on Visual Soft, which means all your data is stored securely on their servers. 

Next Day Shipping Upgrade - Cut off is at 4:00 pm

Orders after that time will be processed the next working day


Please Note: We only deliver ponds and pond plants on our own delivery vehicles!

The blue highlighted area on the map below is where we deliver on our own vehicle! Unfortunately, if you are not in one of these postcode zones we are unable to deliver certain items such as plants, small glass items and selective other products.



We offer a few different delivery options depending on the size and value of your order.

Orders over £50 qualify for free mainland UK (excludes Northern Ireland) delivery which will arrive within 3-5 working days of the order being processed.


Residents of Northern Ireland, please provide your EORI or XI Number.

If you do not have one, please follow the information at


Orders Below £50 in Mainland UK will be charged a standard delivery fee of £5.99.

Additional Shipping Charges

For any orders that do not include Aquariums, the below is charged:

Next Working Day Parcel Delivery to Mainland UK - £7.99 OR £2.99 if the order is over £50

Standard Parcel Delivery to Northern Ireland £8.99

Standard Parcel Delivery to Scottish Highlands & Islands £9.99

Standard Parcel Delivery to Jersey & Guernsey £12.99


For all Aquarium deliveries (Excluding biOrbs & Smaller Aquariums), the below is charged:

Next Working Day Pallet Delivery - £20

2 Hour Booking Slot Pallet Delivery - £20

Pallet Delivery to Northern Ireland - £45

Pallet Delivery to Isle of Wight (PO36 and Above) and Scottish Highlands (AB, PH, IV1-36, IV, KW1-14, KY, PA21-41) - £45

Pallet Delivery to the Scottish Isles (KA27-28, PA60-90, ZE, JE, GY, IM, IV40-56, KW15-17, PH42-44, PA20, PA42-49) - £120

Pallet Delivery to Outer Hebrides (HS) - £140