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Envii Blanketweed Klear

Fast acting blanket weed killer that targets blanket weed floating on the surface of the pond and kills it within 24 hours. Unique bacteria help to prevent any blanket weed from re-growing in the pond.

Available in: 300g & 1KG.

Treats 40,000 litres

Treats 10,000 litres



Treats 40,000 litres

Treats 10,000 litres


Immediate Blanket Weed Treatment for Ponds!

Blanket weed is the devil reincarnated and unfortunately, he has chosen your pond as his next victim. It grows extremely fast, requires very little to thrive and before you know it, the surface of your pond is taken over by the thick stringy weed. Not only very hard to get rid, but also poses a danger to your fish, aquatic plants and wildlife. Which is why it is very important to choose a blanket weed killer that works quickly and safely.

Luckily for you, Envii Blanketweed Klear is blanket weeds kryptonite. Using oxygen, it instantly kills floating blanket weed and will have completely killed it within 24 hours. It kills algae that is floating on top of the water. For submerged algae that is attached to plants, pumps or the side of the pond, you need Envii Algae Klear Xtra. This algae is commonly known as string algae and is regularly confused with blanket weed.

For more information about blanket weed and to determine which algae you have, read our Ultimate Guide To Blanket Weed!

Envii Blanketweed Klear works at low pond temperatures

Temperatures in the UK can fluctuate massively, we all know this as we love to talk about it. However, this makes treating a pond quite difficult as some products only work down to certain temperatures. Once they reach this temperature, they stop working, allowing blanket weed to strengthen again.

We have incorporated innovative bacteria into our blanket weed killer that allow works down to 4°C. Perfect as blanket weed stops growing below 8°C, we’ve got you covered all year!

You can also rest assured that your fish, plants and wildlife will be completely safe when using Envii Blanketweed Klear. As the oxygen we mentioned before it used in the treatment.

How do you Prevent Blanket Weed in Ponds?

You’ve gone to all that effort to kill the blanket weed only for it to come back two weeks later. What a waste of time and money! That’s why we include bacterial follow up tablets in with our blanket weed treatment to prevent any new blanket weed growth. By suppressing the blanket weeds food source, a biologically balanced ecosystem in your pond is created. This acts as a natural defence against blanketweed and other algae.

Here at Envii, we know all about blanket weed! Learn more about blanket weed to help you in the fight against evil! From what it looks like, how it can be dangerous to your fish and most importantly, how to get rid of it.

Before using, we recommend checking your water parameters and ensuring your pH is below 8.5 and KH is around 5. You can do this by using a test kit or applying Envii Pond Equaliser, to instantly stabilise the water parameters.

If the powder meets aquatic plants such as lilies, it may cause some temporary discolouration on foliage.

For ongoing maintenance and to protect your pond from future algae and blanket weed, use Envii Pond Klear or Envii Pond Klear Xtra. These help to keep bacterial levels topped up and the natural defence system strong.

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Use Envii Blanketweed Klear first thing in the morning as this is when algae is at its weakest due to being deprived of sunlight overnight.

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What algae does this work on?
This works on algae that floats on the surface of the water. For submerged algae, use Envii Algae Klear Xtra
Will this kill pond plants?
Envii Blanketweed Klear won't kill pond plants but can cause temporary discoloration if applied directly.
Will this harm my fish?
No, it is safe for fish and will improve their health by increasing the oxygen levels in the water.

How to use

  • 1

    Check the ponds pH before applying and if required, use Pond Equaliser

  • 2

    Scatter the powder on top of the algae to obtain direct contact - 30-50 grams per 1,000 litres of water

  • 3

    If after 24 hours the algae has not turned brown, repeat.

  • 4

    Once algae has died treat the pond with the provided tablets to break the algae down - 1 tablet per 5,000 litres of water

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