Ponds turn green in early spring. That’s pretty much gospel among pond keepers; it’s just the way things are.
Why does it happen?
Basically, there are two types of bacteria in a pond – aerobic (good) and anaerobic (bad). These two types of bacteria are in a constant battle to digest the organic debris that ends up in the pond (twigs, leaves, fish food etc). When the anaerobic (bad) bacteria digests it, it takes a lot longer and produces gases like nitrogen and phosphorus which, in turn, act as a food source for algae. When we add aerobic (good) bacteria to the pond, they overcome to the anaerobic (bad) bacteria and digest the organic debris a lot quicker and don’t create any harmful gases. This is why, when you use bacterial pond treatments you are getting to the source of the problem; rather than just eating the algae, you are starving it of its food source.
The problem is that anaerobic (bad) bacteria can digest organic matter as low as 6°C, whereas aerobic (good) bacteria treatments traditionally work around 10-12°C. This means that all winter your pond is losing the battle against algae and when spring comes, the algae starts to feed.
It’s all about to change
Envii Winter Pond Treatment is a new type of aerobic bacteria treatment. It works as low as 4°C which means that you can win the battle of the bacteria all year round. Its task-specific bacteria digest the organic debris meaning that when you come back to pond in spring, it will stay clear. Then continue to treat with Envii Pond Klear and your pond will never go green again!
This is the first pond treatment designed to work all through the winter!
When the pond water temperature drops below 13°C for over 10 days you can stop feeding the fish. Change to a wheat-germ based food for a few weeks before this as it’s easier to digest and won’t get stuck in their stomach.
Once you have stopped feeding the fish DO NOT start again. Even if the temperature rises above 13°C don’t be tempted to start again as it could quickly drop again and food could get stuck in the fish’s intestinal tract.
Clean out the pond.
Scoop any debris out of the top of the pond with a fine net.
Use a pond vacuum to remove sludge from the bottom of the pond.
If possible, physically clean anything else from the pond without harming the fish. You could do a partial water change to allow easier access to the bottom of the pond.
Use Envii Pond Equaliser to restore the biological balance to the pond.
Attach a pond net around 18″ above the pond surface (leave a few small holes if your pond has frogs or other wildlife that needs to get in and out).
Should I turn my pond pump and filter off?
This depends on where you are in the world. If you live in a really cold climate where the pond is likely to freeze over, then it is best to turn all the equipment off. This is because the fish will hibernate in the warmer water at the bottom of the pond and a pond pump will move the colder surface water around the pond and disturb the warm water.
Generally in the UK you should be fine to leave the pump and filter running as normal.
Envii Winter Pond Treatment is a revolutionary pond treatment that works all winter. It’s the first of its kind because it works as low as 4°C to break down the organic material that builds up in ponds over winter.
This organic material (twigs, leaves, fish food, acidic rain, excrement etc.) acts as a food source for algae which means that in the spring you will find a pond full of algae.