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Envii Winter Pond Treatment

Bacterial pond treatment that cleans ponds during winter to prevent green water and algae in spring.

Each tablet treats 5,000L of water, with each packet containing 9 tablets.

For a limited time, receive three extra tablets for free!


816 in stock


Envii Winter Pond Treatment is a unique treatment that uses beneficial bacteria to keep ponds clean throughout winter and into spring. Ponds are often forgotten about during the winter period as it is too cold to tend to them. However, over this period, organic waste begins to build in the pond and come spring, this waste feeds algae blooms, causing blanket weed and green water.

The bacteria found in Winter Pond work down to and below, 4°C to break up this organic waste. Keeping ponds clean and healthy throughout winter.

Targeted pond treatment for colder conditions

Winter Pond is a much more targeted pond treatment and the high numbers of beneficial bacteria allow it to work for longer in colder conditions. We would therefore recommend the use of this between November & February, reinforced with regular treatments through Spring, Summer & Autumn using Envii Pond Klear or Envii Pond Klear Xtra.

What makes Envii Winter Pond Treatment special?

  • The unique bacteria work below 4°C, allowing the product to work throughout winter
  • Prevents green water and algae from blooming in spring
  • Breaks down organic waste during winter
  • Can be used with or without pumps and filters
  • It’s 100% natural and therefore safe for all fish, pets & wildlife
  • Reduces sludge build-up on the bottom of the pond
  • Each tablet treats 5,000 litres of water
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Keep your pump running during winter. It will help to circulate the bacteria, pass any muck through to your filter and provide essential oxygen for your fish.

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What does this treat?
Envii Winter Pond Treatment breaks up debris in the pond to prevent green water in spring.
Why is this different to Pond Klear?
The product contains a lot more of our unique bacteria, allowing it to work at lower temperatures.
Is this safe for fish and wildlife?
Yes, this is safe for all fish, pets and wildlife.

How to use

  • 1

    Clean filters prior to use

  • 2

    Check pH of pond water and use Pond Equaliser if required

  • 3

    Dissolve 1 tablet per 5,000 litres of water in a bucket of pond water and leave for 2 hours

  • 4

    Distribute evenly throughout the pond

  • 5

    For ponds without filters, use 2 tablets per 5,000 litres of water

  • 6

    Re-apply every 14 days

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