ClearWaters Blanket Weed

100% effective pond treatment with algaecide for complete control of the common garden pond problems of blanket weed (string algae), slime algae and nuisance duckweed! 

This fast-acting, year-round solution delivers excellent results within two weeks and unlike other treatments clears algae and blanket weed in water temperatures as low as 4°C without turning the water milky to help you re-discover the true beauty of your pond! 

Completely safe for use in ornamental ponds and does not contain harmful metals such as copper and zinc! Suitable for use with ultraviolet clarifiers and biological pond filters, it is also harmless to fish, frogs & all birds and animals who decide to visit your pond for a refreshing drink! 

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David

5.0/5.0 Stars

Amazing stuff

“Following a rebuild of my pond, the hot weather came and so did the blanked weed – lots of it, pulling it out by the handful but knowing it would keep on growing. I then read the reviews on Amazon and thought this product deserved a try.

One does in my 6000-litre pond and the difference was amazing within three days. All of the algae gone within a week. I repeated the process two weeks later as per the instructions (although I couldn’t see any algae) and a top-up dose after another two weeks. Since that first treatment, the pond and waterfall are just so clear. I can not recommend this product enough.”

 

Candice

5.0/5.0 Stars

Works in winter temperatures. Excellent stuff

“Great stuff. Had a problem with blanket weed since late summer and tried to treat with barley straw while pond neutralised thinking fishing the weed out regularly and the cold weather would make it disappear over winter, but to no avail! I was reluctant as we have a sturgeon, lots of plants as well as Koi and Goldfish. I had read somewhere that sturgeon can be more susceptible to these sorts of treatments but since they can also get caught in the weed and die (they can’t manoeuvre backwards like other fish), I thought I’d try this. I’m soo pleased with the result after one treatment. Blanket weed not entirely gone but 99% clear. No adverse effect on plants or fish that I can tell after 3 weeks and I’m a little late on second treatment, so expect it to fully clear when it has its 2nd treatment now. (Should be 2 weeks later). Tub should last some time for my smallish pond that is approx. 2000litres (roughly 2×2 metres size with varying depths). Once treated twitch, you add one 25ml scoop/table spoon (Included) for 2000 litres water every fortnight for upkeep. Tup still really full so expect it to last all year. Best part is it works in winter/cold temperatures unlike many other treatments.”

More testimonials here

See our guide to ClearWaters Blanket Weed here.

See how to keep sturgeon and sterlets in the pond here.

What Is Blanket Weed?

Blanket weed, sometimes called “string algae”, is a filamentous green algae often found in ornamental garden ponds which has been introduced accidentally in a variety of ways, including the addition of new pond plants and lilies or simply a bird which previously visited another pond with the algae present within it and has inadvertently carried some over from it.

Will Fish Eat It?

Basically, no. Grass Carp are often added to a pond for this sole purpose, but they will eat other beneficial water plants first, and even then, they will not eat a sufficient amount of the algae. In addition, these fish grow very large and unless housed in an extremely large pond they are not suitable for normal garden ponds.

Will ClearWaters Harm Wildlife?

ClearWaters is harmless to all present and visiting pond animals, including cats, dogs and birds which may visit the pond in order to drink the water.

It is suggested not to add ClearWaters to the pond whilst frogs and toads are spawning and when tadpoles are there. Once the tadpoles have transformed into frogs, however, ClearWaters can be used.

When Can I Use ClearWaters?

ClearWaters is still effective down to a water temperature of 4 degrees celsius, but results are quicker in water above that.

Use ClearWaters as instructed within the instructions when blanket weed is present, or the reduced rate as a preventative during the Spring and Summer months.

As the algae dies, it will consume valuable dissolved oxygen from the water. Particularly in the warmer months of Summer, ensure that there is ample aeration to counteract this oxygen deficit when using any water ClearWaters or any other treatments.

Dissolved oxygen can be improved by increasing the circulation of the water more rigorously at the surface by turning on water pumps to their maximum and/or adding an air pump.

Is Blanket Weed Dangerous to Fish?

To species such as Koi and Goldfish, and provided there is plenty of actual free swimming space within the pond, some blanket weed does not create a problem to them and only to us because it looks unsightly.

For Sturgeon and Sterlet species, however, filamentous algae are highly dangerous and can easily be the cause of these fishes death.

These fish have spiny fins and body coverings which are like lots of tiny anchors. The Sturgeon or Sterlet can swim into the blanket weed, but the small anchors latch hold of the algae that entangles the fish which eventually dies due to suffocation.

Therefore, it is of paramount importance that blanket weed is eliminated from the pond before the introduction of these fish.

More Blanket Weed FAQs here