10 Best Pond Clear Water Treatment For Algae in The UK

Last updated on 05/08/2025

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Envii Pond Klear Xtra – Strong Pond Clear Water Treatment, Naturally Clears Green Pond Water – Treats Up To 100,000 litres

Why We Love It

Powerful multipurpose pond treatment.
Natural beneficial bacteria usage.
Safe for aquatic life.

Main Highlights

Multipurpose Pond Treatment – Pond Klear Xtra is a multipurpose treatment helping clear green & murky water, maintain healthy sludge levels & help reduces the chance of blanket weed.
Natural Beneficial Bacteria Treatment – Containing billions of natural beneficial bacteria, Pond Klear Xtra is 3 x stronger than our original Pond Klear. This makes it one of the strongest treatments on the market.
Safe for all Fish & Wildlife – Like all Envii pond products, Pond Klear Xtra is safe for all fish, wildlife & plants. This can be used in conjunction with all other bacteria treatments.
Easy to use – With a built in measuring chamber, applications are really easy. We recommend using 10ml per 1,000 litres of water. This makes for reliable and quick treatments.
Treats a Large Volume of Water – Pond Klear Xtra treats up to 100,000 litres of pond water. If your pond is under 20,000 litres, this means you will get multiple treatments to last you through the year.

AquaDesign CLEAR POND Water Clarifier 2500ml - Clears Green & Cloudy Water - TREATS 12,500L

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Why We Love It

Removes haze and cloudiness.
Safe for fish and plants.
Visible results in under 24 hours.

Main Highlights

AquaDesign POND CLEAR removes haze, cloudiness and green water
Non-toxic formula is safe for fish and plants
Fast acting - visible results in under 24 hours
Easy to dose Liquid
Available in 1000ml, 2500ml and 5000ml sizes
Comes with 3ml pipette for dosing

Evolution Aqua Pure Duo Pack Pond Bomb & Sludge Bomb Pond Clear Water Treatment Pond Sludge Remover - Duo Value Pack Offers Complete Natural Pond Water Treatment for Fish Ponds

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Why We Love It

Boosts pond health naturally.
Reduces maintenance effort.
Award-winning UK product.

Main Highlights

✔ Contains 1 x PURE Sludge Bomb, 1 x PURE Pond Bomb - A perfect combination of aerobic and anaerobic bacteria and enzymes working efficiently together as a complete pond clear water treatment for small ponds, large fish ponds and water features.
✔ Digests sludge and cleans up organic waste - PURE Sludge Bomb contains an optimal mix of all natural anaerobic enzymes and bacteria that work as an effective pond cleaner treatment and sludge buster for garden ponds.
✔ Natural fast acting chemical free clear water pond treatment - PURE Pond Bomb contains the perfect formula of aerobic enzymes and bacteria designed to quickly break down organic waste in water, leaving your pond clean and fish healthy.
✔ Reduces filter and pond maintenance – Naturally removes excess smelly organic waste, reducing the need to use chemical algae remover and harsh blanket weed treatments for ponds. Pure Duo Pack Pond Bombs also work as an ammonia and nitrite remover.
✔ Award winning product manufactured in the UK – Part of the Evolution Aqua award winning range of bacterial products for ponds, freshwater and marine aquariums.

Envii Pond Klear - Natural Green Pond Water Treatment, Clears Green and Murky Water for Crystal Clear Healthy Water, Safe for all Fish and Wildlife -1L Treats 40,000 Litres

Why We Love It

Clears green, murky pond water.
Contains beneficial, safe bacteria.
Improves water clarity efficiently.

Main Highlights

Clears Green & Murky Pond Water - Pond Klear clears green and murky water by targetting microscopic particles and nutrients in ponds, clumping them at the bottom of the pond. This will be removed by a pump and filter or digested by the bacteria.
Contains Millions of Benefical Bacteria - Pond Klear contains no harsh chemicals and is completely natural making it safe for all fish including koi & sturgeon, wildlife & plants
Improved Water Clarity - Used weekly, Pond Klear will help improve the clarity of the pond water along with benefiting fishes health by removing phosphates and replenishing good bacteria
Easy to Use Bottle - With an accurate dosing chamber, applications are really easy to ensure you're using enough per treatment to suit the size of your pond
Treats Large Areas of Water - Pond Klear 1L bottle will treat up to 40,000 litres of water. All instructions are on the back of the bottle

envii Algae Klear Xtra – Blanket Weed Treatment for Ponds, Removes Blanket weed & String Algae Working All Year Round, Safe for all Fish & Plants – 500ml Treats 10,000 litres

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Why We Love It

Effectively removes submerged algae.
Prevents new algae growth.
Completely safe for all.

Main Highlights

Blanket Weed Remover – Algae Klear Xtra safely removes submerged blanket weed and string algae in all ponds. Our algae treatment can be used all year round making it suitable for treatments through winter.
Fast Acting Treatment – Specifically designed to target and kill all submerged algae effectively within 3 weeks of the first treatment.
Helps Prevent New Algae – Due to our unique UV light filter, this will help supress the growth of new blanket weed and algae at any temperature.
Safe for All Fish – Algae Klear Xtra is completely safe for all fish & plants whilst encouraging the overall health of your pond.
Treatments – A 500ml bottle is enough to treat 10,000 litres. We also have a 1L bottle which treats 20,000L & 5L treats 100,000L.

Blagdon Clear Pond Water Treatment, 1 Litre, Clears Dirty Green or Brown Cloudy Water Quickly, Natural, Wildlife Safe, Harmless to Fish and Filter Bacteria, 1L, Treats 20,000 Litres of Water

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Why We Love It

Clears dirty pond water quickly.
Enhances pond's mechanical filtration.
Naturally safe for all species.

Main Highlights

CLEARS DIRTY POND WATER - Clear Pond rapidly clears green, cloudy, dirty or milky water by clumping together suspended particles causing them to sink to the bottom of the pond or to become trapped in the filter
FAST ACTING - you should expect to see great results within just a few hours
NATURALLY SAFE - Clear Pond is harmless to filters and all species of pond fish, plants and water using wildlife
ENHANCES FILTRATION - Clear Pond enhances mechanical filtration in your pond to help keep your water crystal clear
ACCURATE DOSING CHAMBER - the accurate dosing chamber makes for easy, no mess measurement of treatment to suit the size of pond – shake bottle well for best results

ClearWaters Blanket Weed Treatment for Ponds – 1L Bucket to Treat 10,000 / Maintain 80,000L – Quick Action Pond Weed Treament for Blanket Weed – Pond Cleaner Safe for Fish and Wildlife

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Why We Love It

Use supports eco-friendly pest control.
Varying packaging adds interest.
Promotes preservation of natural habitats.

Main Highlights

Not for use in ornamental ponds when frogs/toads spawning as they will want to lay their eggs in the blanked weed. Not for use in public wildlife ponds.
Packaging may vary

Hydra Fountain Clear Water Feature Cleaner | 250ml Treats 7,500L Highest Dilution Rates - Water Feature Treatment Keeps Water Crystal Clear from Algae, Cleans Water & Biofilm Build-up

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Why We Love It

Crystal clear water year-round.
Safe on all materials.
Effective against harmful bacteria.

Main Highlights

Crystal Clear Water: The Hydra Fountain Clear is a water fountain clarifier that can be used all year in both indoor and outdoor water systems. The water treatment saves hours of manual cleaning and rapidly removes algae. It is an algaecide that minimises slime build-up in fountains and water features.
Safe to USE: The fountain clear water treatment is safe to use on all types of materials like stones, resin, and metals including stainless steel and brass. It is a safe water cleaner that ensures a shelf life of 3 years without causing any foam.
Sterilise Easily: Water feature care uses the best fountain clear treatment complete water sterilisation, and prevents harmful bacteria. It is an algae remover that is also effective against Legionella (Legionnaires' Disease).
Shock Dose System: The algaecide for water features and fountains gives total protection against algae and green water in all water recirculation systems. All you need to do is a shock dose system that will clear the water in a couple of days. Shock Dose Rate 1:10,000. Maintenance Dose Rate 1:30,000.
Precautions: Do not use it in a water system with any aquatic life in it. Used with dilution, this product is non-toxic, safe for animals, and birds equally effective in hard water. If treated water splashes on surrounding plants & flowers, it should not harm them. In case of any queries feel free to contact us.

NT Labs Pond Magiclear, Clears Green and Cloudy Water, Control Against Algae Build up, Improves Pond Water Quality, Pond Water Flocculant (1 Litre)

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Why We Love It

Clears green, cloudy water.
Easy to use.
Suitable for all ponds.

Main Highlights

【CLEARS GREEN AND CLOUDY POND WATER】: Use when water appears green and/or cloudy. Magiclear causes particles in the water to clump together which can then easily settle out of suspension or be removed by the filter.
【EASY TO USE】: To work out the required dosage for your pond, simply calculate the volume of your pond in litres (length x width x depth (in cm)/1000) or alternatively, use our Online Dosage Calculator. Test the pH and KH of the water (Do not use if the KH is below 6 or the pH is below 7). Aerate pond well e.g. fountain, waterfall or air pump. Conduct a partial water change (as much as is practical) before use, especially if the water is extremely green, like “pea soup”. Switch off pump only if strong flow rate could prevent particles from clumping but remember to switch back on as soon as water clarifies.
【SUITABLE FOR USE WITH A FILTERLESS POND】: Without a filter, some clumps may float and can then be removed using a net. Use when you have plenty of time to observe the fish and take action in the unlikely event of a reaction.
【POND WATER FLOCCULANT】: Magiclear is a flocculant, meaning it causes particles to clump together. Follow with a dose of NT Labs Sludgeclear to clear any excess sludge which may settle at the bottom of your pond
【SUITABLE FOR ALL POND KEEPERS】:The ease of use of Pond Magiclear means it is perfect for use by beginners and seasoned pond keepers alike.

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

19% Off

Why We Love It

All-in-one pond care solution.
Wildlife and pet safe product.
Effective blanketweed reduction promises.

Main Highlights

ALL IN ONE TREATMENT - the soluble pouches harmlessly dissolve, releasing gentle active ingredients, to clean your pond, clears blanketweed, eats pond sludge, feeds aquatic plants, reduces filter cleaning, makes tap water safe by removing harmful toxins
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
BLANKETWEED REDUCTION - should become apparent within a month of starting treatment. 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
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

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We scanned 807 products

We reviewed these offers relevant to the Pond Clear Water Treatment For Algae within online retailers such as Amazon, eBay and other local retailers, ensuring we covered all major brands and models. The products we selected come from trusted brands like envii, AquaDesign, Evolution Aqua, Blagdon, CLEAR waters, HYDRA, NT Labs, all of which have a reputation for consistently delivering high-quality products that users love and innovative approaches for function & design.

For the best Pond Clear Water Treatment For Algae in the market, we considered we took a deep dive into 4036 online reviews , focusing on elements like user satisfaction, performance in real-world conditions, and long-term reliability. Our ranking also evaluates each review’s relevancy, authenticity, up-to-dateness and depth so that the comparison is more sound.

We concluded that:

The clear winner of our analysis is Envii Pond Klear Xtra – Strong Pond Clear Water Treatment, Naturally Clears Green Pond Water – Treats Up To 100,000 litres. We love many things about this product by envii. What sets it apart from the competition is Powerful multipurpose pond treatment, Natural beneficial bacteria usage. , Safe for aquatic life.
The best value product for most shoppers and where user satisfaction is continuously the highest is AquaDesign CLEAR POND Water Clarifier 2500ml - Clears Green & Cloudy Water - TREATS 12,500L by AquaDesign based on online reviews by bloggers, experts and online shoppers.
The biggest bargain at the moment for Pond Clear Water Treatment For Algae and the best cost-to-value ratio is Blagdon Clear Pond Water Treatment, 1 Litre, Clears Dirty Green or Brown Cloudy Water Quickly, Natural, Wildlife Safe, Harmless to Fish and Filter Bacteria, 1L, Treats 20,000 Litres of Waterat Blagdon with a 27% discount.
Our list of the best Pond Clear Water Treatment For Algae is updated regularly to reflect new releases and changes in product availability, so be sure to check back often for the latest rankings and discounts.

10 Best Pond Clear Water Treatment For Algae in The UK

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We scanned 807 products

We concluded that: