Algae Klear Xtra

Fast-acting pond algae treatment that targets and kills submerged blanket weed and string algae within 2 weeks. Works at any temperature and prevents the re-growth of algae due to its unique UV light filter.

£20.95

500ml Treats 10,000 Litres

Free UK 48hr Delivery 

Order Within for delivery between November 14 and November 16 

Say goodbye to unsightly algae and blanket weed with Algae Klear Xtra, a highly effective pond algae treatment that eliminates algae and blanket weed within 2-3 weeks. This unique formula targets algae directly, killing it down to the root and preventing regrowth.

In addition to its powerful algae-killing action, Algae Klear Xtra contains a UV light filter that reduces the strength of UV rays, helping to prevent new algae growth and keeping your pond clear and vibrant.

Ideal for treating algae submerged below the water's surface—typically on pond walls, pumps, and plants—Algae Klear Xtra is the go-to solution for managing stubborn algae. If you're dealing with algae floating on the water’s surface, you’ll need Blanketweed Klear. Not sure which type of algae you have? Check out our Ultimate Guide to Blanket Weed for more information.

To keep your pond algae-free long-term, pair Algae Klear Xtra with Pond Klear to reduce excess nutrients in the water and Pond Equaliser to maintain a stable pH level.

  1. Check pH of your pond before using and use Pond Equaliser if required
  2. Use in the morning when most effective
  3. Use 50ml of Envii Algae Klear Xtra per 1,000 litres of pond water
  4. Add to a watering can of pond water and distribute evenly in pond
  5. Repeat after 7 days if algae is still present and further treatment is required
  • Fast acting formula that kills pond algae down to the root within weeks.
  • Use at any time of year.
  • Kills algae and blanket weed below the surface of the water.
  • Contains a UV light filter to prevent new algae from growing.
  • Is safe for fish & plants.
  • Use in conjunction with all other Envii pond products.
  • 500ml treats 10,000L, 1L treats 20,000L & 5L treats 100,000L.
  • Copper Sulfate

If you have any questions or need any advice, call us on 01246 240880, email us info@envii.co.uk, or chat live with one of our team.

£20.95

Overall rating: 4.3574767 / 5 from 428 reviews.

AI Generated Review Summary

Algae Klear Xtra effectively eliminates algae and blanket weed within 2-3 weeks. Customers praise its results, effectiveness, and ease of use. It also contains a UV light filter to prevent new algae growth. For floating algae, consider Blanketweed Klear. Pair with Pond Klear and Pond Equaliser for long-term pond health.

Summary topics

  • Effectiveness (10%): Customers keep praising the results of the product, with many describing it as very good and impressive.
  • Dosage Effectiveness (4%): It was highlighted by customers that the dose was very effective and they were very pleased with it.
  • Pond Clearing (4%): Customers expressed appreciation for how well the product cleared the pond, with multiple reviews highlighting its effectiveness.
  • Ease of Use (5%): In general, customers find the Algae Klear Xtra easy to use and effective in clearing algae.
  • Treatment Effectiveness (3%): Customers appreciated the effectiveness of this treatment, as it effectively eliminates algae in pond water.

Review topics: ["instructions","delivery","results","problems","water","improvement","weather","works","service","price","use","pond","algae","difference","dose","treatment","cleared","weed","fish","koi","effect","application","quantities","4 stars","solution","supplier","blanket weed"].

Review highlights

  • "Great product - used first dose already with good results." — VerifiedCustomer
  • "Impressive results; has been treated three times now and cleared pond well of algae." — Anonymous
  • "Great product, great service, easy website, thanks" — VerifiedCustomer

Reviews

Having used Pond Equaliser,then PondKlear

"Having used Pond Equaliser,then PondKlear Xtra at 2 doses of 200ml and 6 doses of 100ml before 2doses of 500ml of AlgaeKlear Xtra I am disappointed that the clarity of my pond water is not what I had hoped for. The AlgaeKlear xtra has decreased some of the algae under the water on the pond walls and shelf but has not removed it. Having spent £96.85 I feel your products are not giving the results I had expected."

— Terence S. (5/5)

Followed the instructions precisely over

"Followed the instructions precisely over the recommended three week period including checking PH levels etc. Though the blanket weed strands seemed to become thinner initially, the spread did not reduce and overall I would rate this product as having no improvement at all to the level of blanket weed in my pond."

— D R. (2/5)

Not good

"Done everything it said but didn't solve the problem"

— Brian T. (5/5)

Excellent product

"Clears algae quickly and doesn't cloud the pond"

— Marilyn W. (5/5)

Great product! Worked very well

"Great product! Worked very well and I've bought this before so that says it all!"

— Roy P. (5/5)

Negative results

"After two doses it seems to be feeding the algae string on my plants, it's getting worse and now into month of October"

— Andrew R. (1/5)

Some improvement, but not there yet.

"Pumped out my pond filter and then added Algae Klear Xtra and also Pond Clear weekly for the last 5 weeks. There is some improvement to the algae but it has not worked as well as I hoped it might. The stones are still covered, which is a bit disappointing, but the plants are not as covered with green strands as they used to be, which is a good result. The water has been very clear throughout. Not quite sure what to do next. Might give it another 5 week dose, but it's now getting a bit costly. Envii have been very helpful throughout in giving advice but I'm beginning to think that algae are quite difficult to clear."

— PETER A. (3/5)

I have a large pond

"I have a large pond which after the weather we’ve had was rapidly getting a lot of algae. I bought this and used it twice over three weeks and now I can see the water is clear and koi are happier!"

— Jayne C. (5/5)

Not wildlife friendly

"I used this on my wildlife pond it killed my snails and smaller wildlife My pond was only 190 litres so I have emptied it and started again Its not safe for wildlife"

— Gill (1/5)

With the full long period

"With the full long period of sun this year my pond suffered a huge blanket weed bloom clogging my whole pond and bottom drain. It took 2 applications of your product but that cleared it all and my pond is running perfectly and clear. Really pleased with the results"

— C w. (5/5)

Q&A

Is this suitable for surface algae, with bubbles in it?
Hi there, Algae Klear Xtra is designed to target submerged algae, rather than algae that is floating on the surface of the water. For surface algae, we would recommend Blanketweed Klear. If you would like, please feel free to email us a photograph of your pond, and we can take a look and advise which product would be most suitable. Our email address is info@envii.co.uk. Many thanks, Envii
Is this product safe for use around dogs. My Puppy likes to drink from the fountain
Hi Denis, Yes, when used correctly and added to the pond, Algae Klear Xtra is completely safe for all pets and wildlife. Many thanks, Envii
what can I use if I have snails in my pond
Hi Jackie, A more natural approach would be to target the food source for the algae, which is typically sludge. At the bottom of most ponds is a layer of sludge, made up of decaying leaves, twigs, fish waste and fish food. As this organic matter begins to break down, it releases nutrients into the water that feed algae and green water. By breaking down this sludge using a product such as Sludge Klear, you remove the food source for the algae and in turn, it begins to starve and die. This is a much slower process than using an algaecide such as Algae Klear Xtra, but it is a more natural approach and is safe for all wildlife including snails. Many thanks, Envii
I have a small wildlife pond in my garden (circa 300l) with a thriving population of smooth newts. It's recently been getting lots of thick gloomy string algae growth though. Is the product safe and appropriate to use with the newts there? Thanks
Hi Henry, Yes, Algae Klear Xtra is safe to use with newts in the pond. This product contains copper sulphate which can be harmful to aquatic snails and other crustaceans, so we wouldn't recommend using this product if there are snails present. Many thanks, Envii