Top 9 Blanket Weed Killer for Ponds UK – Water Garden & Pond Treatment

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1. Green Lightning

Pond Plants & Wildlife, Treats 23,000 Litres, Eco-Friendly and Biocide Free, 100g, Green Lightning Blanket Weed Killer, Pond Clear Water Treatment, Safe for Fish, Pond Weed

Green Lightning - This blanket weed pond treatment clarifies the water, without causing any harm to wildlife. This pond cleaner treatment does not contain any algaecides which can be harmful to fish, plant and pond life. Fast acting: results in 7-10 days. This green water treatment for ponds effectively controls swimming or floating unicellular and filamentous algae such as BLANKET WEED.

This fast-acting, year-round biological solution delivers results within 7 to 10 days after treatment. Easy to use: simply throw the water soluble sachet into the centre of the pond or where the Blanket Weed is growing. Safe for wildlife: weeds can be a choking and tangling hazard to your fish, especially spiny species such as Sturgeon! Our blanket weed killer has been created to kill weeds whilst being Eco-friendly and Biocide free. The plastic dissolves, releasing a trillion freeze dried bacteria which destroys the blanket weed.

Treats 23000 litres: our 100g sachet treats 23000 litres of water. Our pond blanket weed treatment improves the clarity of your water and reduces unpleasant odours within days of treatment. Green lightning is a well established natural microbial product for use in static and slow moving water. Now with extra boost - we have added in a special booster to our product which means it will now clear your water more efficiently and effectively.
BrandGreen Lightning
ManufacturerSplendid Products
Weight0.1 kg (0.22 Pounds)
Part Number4131

2. envii

Envii Blanketweed Klear – Treatment for Ponds, Kills Floating Blanket Weed in 24 Hours, Treats 10,000 Litres 2,200 Gallons

envii - Suitable for use in winter. Multipurpose treatment that kills floating blanket weed, stops it from reoccurring and works in any temperature. Blanketweed klear uses a powder to kill surface floating blanket weed in 24 hours. Immediate results with no adverse effects on fish. 1 x 300g pouch treats 10, 000 litres. Helps to control varying degrees of blanket weed in ponds of all sizes.
Weight0.3 kg (0.66 Pounds)

3. envii

Envii Algae Klear Xtra – Blanket Weed Control Treatment for Ponds, Safe for All Fish & Wildlife – Treats 10,000 Litres 2200 Gallons

envii - Uses a unique UV light filter to prevent new growth. Kills submerged blanket weed and string algae in ponds. Suitable for use in winter. Can be used at any temperature to control blanket weed & string algae. 500ml bottle treats 10, 000 litres. This algae remover is suitable for all ponds and is safe for fish, wildlife and plants.
Weight0.56 kg (1.23 Pounds)
Part NumberAK

4. Blagdon

Makes Tap Water Safe, Clears Blanket Weed, Pet & Wildlife Safe pack of 6 pods, Feeds Aquatic Plants, Blagdon Clean Pond Pods, Removes Chlorine, Eats Pond Sludge, Reduces Filter Cleaning

Blagdon - Blanketweed reduction - should become apparent within a month of starting treatment. Reduces pond & filter maintenance – the pods work within the pond ecosystem, most effective when used over a consistent period of time and are not an overnight solution, once established the unique formula will soon have your pond crystal clear.

Pet & wildlife safe – our clean pond pods are harmless to pets and wildlife, beneficial to filter bacteria and can be used in wildlife ponds and ponds with fish and other pond water inhabitants. All in one treatment - the soluble pouches harmlessly dissolve, releasing gentle active ingredients, reduces filter cleaning, feeds aquatic plants, to clean your pond, clears blanketweed, eats pond sludge, makes tap water safe by removing harmful toxins.

Use effectively in a filter - clean pond pods can be used in conjunction with Blagdon Clean Pond Machine Filter for exceptional results. However, clean pond pods are also suitable for direct to pond use and with most other filter systems. For long-term effectiveness, usage should begin when temperatures reach 10°C around April in the UK and continued monthly until temperatures drop below 10°C.
Height7 cm (2.76 Inches)
Length18 cm (7.09 Inches)
Width12 cm (4.72 Inches)
Part Number2831

5. Aquacadabra

Aquacadabra Vanquish Blanketweed Pond Water Solution Remove Nuisance Algae Blanket Weed 1L

Aquacadabra - Vanquish blanketweed uses unique hydro gel technology to flocculate all floating green algae and deters further blanketweed growth. Algae will spoil the appearance of any pond, destroying  the biological balance, damaging plants and even killing  fish. Designed to control many types of pond algae including blanketweed. Aquacadabra vanquish blanketweed is an excellent  product designed to control these many types of pond  algae including blanketweed. 1 litre - treats up to 22, 752L 5, 000 Gallons.
Part NumberVANQ1863

6. All Pond Solutions

Treats 11250 Litres 2500 Gallons, All Pond Solutions PondRescue Blanket Weed Treatment for Ponds 1KG

All Pond Solutions - Designed to successfully banish blanketweed from your pond. Safe for your pond - can be used with pond fish, plants and biological filtration. Keep your pond looking attractive - blanketweed can look unappealing so eliminating it will keep your pond looking clean and healthy. Helps keep your filter functioning - blanketweed can cause blockages in pumps and filters. Designed to successfully banish blanketweed from your pond using natural minerals and enzymes. Fast acting low-cloud formula - the water will first appear cloudy after use but after a few days that will clear.
BrandAll Pond Solutions
ManufacturerAll Pond Solutions
Height18.5 cm (7.28 Inches)
Length8.5 cm (3.35 Inches)
Width8.5 cm (3.35 Inches)


HYDRA Blanket Weed & String Algae Treatment for Lake and Larger Pond Water LAKE CLEAR 25KG

HYDRA - Shelf life 3 years, 1 kilo treats up to 160m². Safe to use in water with fish or any other form of aquatic life. Poses no danger to birds, invertebrates, reptiles, water plants, wild or pet animals, human and mammals. Biological blanket weed treatment, ideal for large bodies of water. Rapid action - No waiting weeks for results. Same safe biodegradable action as barley straw but without the mess.
ManufacturerHydra International Ltd
Weight25 kg (55.12 Pounds)

8. Aquacadabra

Aquacadabra Vanquish Blanketweed Powder Pond Water Solution Remove Nuisance Algae Blanket Weed 1kg

Aquacadabra - Dying algae can further decrease oxygen levels. Safe on fish, plants & biological filters. If this occurs, flush out your pond with fresh cold water remembering to add Vanquish Chlorine. Important: on hot days pond oxygen levels can be low. 1kg - treats up to 11250L 2, 500 Gallons. Aquacadabra vanquish blanketweed is an infusion of all-natural minerals and additives which when added to your pond will successfully combat blanketweed. Aquacadabra vanquish Blanketweed Powder: an infusion of natural minerals, enzymes and additives.
Weight1 kg (2.2 Pounds)
Part NumberVANQ2020

9. Industrial Leisure

Industrial Leisure Banish Pond Blanketweed Treatment 1 Litre, Treats 22750 Litres

Industrial Leisure - Effective Treatment for Blanketweed. Uses hydro gel technology to flocculate green algae. Works quickly. Harmless to fish, pond life and plants. 1 litre treats 22750 Litres 5000 Gallons.
BrandIndustrial Leisure
ManufacturerIndustrial Leisure