Stop Blanketweed

Eradicates blanket weed in ponds

STOP Blanketweed is an effective treatment of filamentous algae, commonly known as blanket weed in ornamental and garden ponds. Blanket weed is one of the most hated problems of pond keeping and a nuisance to everyone as it makes your pond unsightly, blocks filters, pumps and pipes. STOP Blanketweed is a unique product which will successfully eradicate blanket weed when used as instructed.

400g (Treats up to 4,000 litres / 880 Gallons)

1kg (Treats up to 10,000 litres / 2,200 Gallons)

2.5kg (Treats up to 25,000 litres / 5,500 Gallons)

4kg (Treats up to 40,000 litres / 8,800 Gallons) HSE No. 9647

Stop Blanketweed

Dosage Instructions

• Apply 30 grams (one scoop) of powder per 900 litres / 198 gallons of water.

• Mix the powder thoroughly with pond water in a suitable clean container.

• Now distribute this mixture evenly over the pond surface.

• Add this dose once per week until the blanket weed has gone, usually after 3 weeks.

• One or two additional doses may be needed in some ponds.

• Continue to dose once a month to prevent the blanket weed returning.

• If water temperature is below 8°C, treatment efficiency is reduced.

Pond size in litresPond size in gallonsDosage in grams2 - 4 weekly doses to eradicate blanketweed
90019830grmOne Scoop
180039660grmTwo Scoops
270059490grmThree Scoops
3600792120grmFour Scoops
4500990150grmFive Scoops
90001980300grmTen Scoops

Frequently Asked Questions

FAQs: provide answers to the most frequently asked questions. Start typing the product name + your questions in the search box. Or click here to access the FAQs databse.

Stop Blanketweed FAQs
Is Stop Blanketweed safe to use with all pond fish?
Stop Blanketweed safe to use with all ornamental pond fish.
Is Stop Blanketweed safe to use with wildlife?
We recommend Stop Blanketweed is not used when frogs and newts are spawning.
Will Stop Blanketweed turn my water cloudy?
Stop Blanketweed may occasionally turn pond water white and cloudy for a few days, but water will clear.
Do I need a pond filter for Stop Blanketweed to work?
Evolution Aqua Stop Blanketweed is most effective in ponds with moving water, from a pump, filter, fountain or waterfall, and strong surface agitation, or aeration from an airpump and airstone is recommended.
Should I switch my Ultra Violet Clarfier Off when using Stop Blanketweed?
UV clarifiers do not need to be turned off when using Evolution Aqua Stop Blanketweed
How often should I use Stop Blanketweed?
Dose the recommended amount of Stop Blanketweed once a week for four weeks, dose monthly after the initial application to maintain clear water.
Will water temperature effect the performance of Stop Blanketweed?
If water temperature is below 8°, treatment efficiency is reduced. Stop Blanketweed will be more effective as temperatures rise.
Is Stop Blanketweed safe to use in planted ponds?
Stop Blanketweed is safe to use in planted ponds, and should have no effect on the plants.
Will Stop Blanketweed eradicate pond moss?
No, it will not eradicate pond moss.
I treated my pond with Stop Blanketweed but I now need to treat my fish with a medication. How long should I wait before I use another chemical?
Our advice is to leave it 7 days after using one treatment before you use another treatment. And also carry out a partial water change if needed, if the medication may react with the first. Please note, in the case of the Stop Blanketweed, for this treatment to be at its most effective the advice is...
I have Sturgeon, Can I use Stop Blanketweed?
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