Tag Archives: Pond Klear Xtra

Why Do Ponds Go Green In The Spring?

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!

For more information on Envii Winter Pond Treatment, click here. 


Customer Stories – Adrian Rodgers

Here’s a great review we recieved about Pond Klear from Amazon Customer, Adrian Rodgers –

“For as many years as I can recall our well stocked fish pond has turned green in spring and we haven’t seen a fish until almost autumn. We’ve tried plants (much to the delight of our grass carp), as many chemical remedies to reduce the algae bloom as there are on the market and traditional barley hay. It’s safe to say that we have never known what eventually gets on top of the problem, it just clears one day.

This year however is different. We introduced your product in early April during which, luckily for us, there was a really cold spell which, presumably delayed the onset of our annual algal bloom problem. Your product states that it works at cold temperatures but nevertheless given our 10 year experience of green water and the multiple products used I must say not much success was anticipated. I’m delighted to state that I was completely wrong. I followed up with a second dose a week later and at about 1 month from dose 1 I’ve added a third. We’re now mid May and the pond is delightfully clear despite the warmer weather and long daylight hours. We no longer have to wait until feeding time for a glimpse of a fish mouth!

Further, the slurry I remove from the filter box no longer sends a whiffy bad eggs aroma up my nose when I lift the lid and I suppose this is a further effect of your product.

An excellent product which I will buy again.


Adrian Rodgers, delighted customer.”

Click here to buy Envii Pond Klear 

Customer Stories – Wolfhound Mum

“Wolfhound Mum” bought a bottle of Pond Klear on Amazon. Here’s what she wrote about her experience

“After having problems with both my UV lights, the water in my pond had become really bad, not only green, but the debris suspended in the water made it impossible to see all but the largest fish (& then only when near the surface). I bought this on a whim, not really convinced it would work, it seemed too good to be true. Wow… This stuff is amazing. I used double the dose as recommended for the 1st application on a Wednesday night & by Friday morn’ not only could I see all my fish, I could see the bottom of the pond. The fact it was harmless to dogs was essential as even though my pond is raised, our wolfhounds use it as a large drinking bowl. They are all fine but probably scare the heck out of my previously sight impaired fish. Can’t recommend enough. I would not have been able to see these fish just 4 days ago.”

Click here to buy from our website .




How To Clean A Pond Without A Filter

We’re constantly being asked –  Will Envii Pond Klear work on a pond without a filter?

The short answer is that it does work on ponds without filters.

Here’s the longer answer…

The bacteria in Pond Klear eat the organic matter (i.e. twigs, bird poo, fish food etc) that decays causing algae and sludge. However, it would be a tall order for them to eat all of the algae and sludge created so they also detach it from any surfaces and clump it together allowing it to be caught in the filter.

So Pond Klear WILL work in a pond without a filter but it won’t work anywhere near as quickly.

Because of this we generally recommend that people use Pond Klear Xtra and Sludge Klear in a pond without a filter. These products together have a far higher concentration of bacteria and work in tandem to eat the organic matter. While it is more expensive, you are guaranteed results.

It’s also worth physically cleaning your pond as best you can by removing anything from the surface. This will give the bacteria less to do and make it work quicker.

For more information on the Envii Pond Range, click here.

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Pond Klear – 10 Day Test in Fish Pond

Over the last two weeks or so, we’ve been testing Pond Klear in a real-life situation. A customer bought a bottle of Pond Klear Xtra and approached us for some advice and after hearing how green his pond was we saw a great opportunity to show what our product is capable of.


This is the pond, complete with an unsightly metal gate to keep the herons out. Believe it or not there are a few beautiful fish hidden in there but we had to take his word for it! We put 150ml of Pond Klear Xtra into a bucket of pond water and distributed evenly over the pond surface. A normal dose for a pond of this size would be 50ml but we always recommend starting off with a double or triple dose to allow the bacteria to become established.



Pond Test Day 1

This picture shows the pond after 1 day. As you can see the bacteria has started to take effect. The fish are just about visible although it’s very difficult to see any of their patterns. The floor of the pond is definitely not visible and there is a strong green colour to the water.



Pond Test Day 5

This is after 5 days. There is a clear difference; the structure of the pond is visible; the fish are visible (but quite hard to spot in this picture); and the pond generally looks a lot healthier. At this point we gave the pond another standard dose (50ml) of Xtra and cleaned out the filter. It’s extremely important to clean the filter as often as possible because the bacteria in Pond Klear will dislodge a lot of organic material which will then get caught in the filter. While this is a good thing, if too much material gets stuck in the water it will stop working.



Pond Test Day 10

This shows the pond 10 days after first dosage. As you can see the Pond Klear Xtra has completely cleared the pond. The floor of the pond is visible and you can even see the frogspawn hidden beneath the surface. This really shows how effective Pond Klear can be if it’s used correctly.


There are a few reasons Pond Klear has worked so well on this pond –

It has a working filter – The bacteria in Pond Klear (and all Envii Pond products) do two things. They eat some of the organic material and dislodge the rest. This means that the organic material that has been dislodged (or disturbed) will then be sucked into the filter. If you clean your filter every few days while treating Pond Klear will work considerably faster.

Started with a triple dose – You can’t really overdose with Pond Klear. While we wouldn’t recommend putting a whole bottle in, it’s perfectly safe to start with a double or triple dose. Bacteria reproduces logarithmically (1 becomes 2, 2 becomes 4 etc.) so by starting with a strong dose it will get to work much quicker.

Used Pond Klear XtraPond Klear and Pond Klear Xtra are exactly the same except Xtra is 3x stronger. For a pond as green as this one we’d always recommend using Xtra as it will get to work much quicker. At £27.99 you get the equivalent of 3 bottles of Pond Klear for the price of 2.

No UV lights – UV lights kill both good and bad bacteria. This means that, while they do help keep your pond clear, they will render any bacteria treatment useless. If you have any UV lights make sure to turn them off for 2-3 days during treatment.  

For more information on the Envii Pond Range click here.

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The perfect storm in your pond

Last month we wrote an article for Koi Carp Magazine. Here it is –


This winter has been warm! The average temperature in December was a balmy 8°C and January wasn’t much colder. Plants are blooming months earlier than they should and insects don’t know whether to hibernate or pollinate.. It’s almost as though the difference between the seasons are becoming indistinguishable. But what effect will this have on our pond’s biological balance when the ‘real’ spring arrives?

Let’s start from the top. Your pond is naturally full of organic matter. Whether it’s the twigs from overhanging trees, droppings from an unwelcome pigeon or your beloved koi’s own bodily functions, every pond is full of organic material that will decay. This process of decay introduces substances such as phosphorous, ammonia and hydrogen sulphide into the pond water. Small amounts are fine, in fact they’re normal, but too much and they can easily affect water quality and the health of your fish. We call this the “organic loading” of a pond. The more organics, the more decay, the more adverse effects on water quality.

This is the essence of most pond water problems. If the pond’s biological balance is out of kilter, you open the door for excessive amounts of ammonia, nitrites, nitrates, phosphates, urea, faecal matter and dead organic waste. Therefore most owners use various pond treatments tackle this issue by introducing task-specific ‘good’ bacteria into the pond environment.

The reduction in these contaminants improves the quality of the water and that combats a wide range of aquatic pathogens and diseases such as: streptococcus, pseudomonas, aeromonas, vibrio and burkholderia. In essence ‘good’ bacteria tackle the ‘bad’ bacteria that are effectively feeding off the organic matter in the pond.

But surely a warm, mild winter is good for us and there will be less adverse effects in Spring?

This is where the answer gets a little muddy (pun very much intended). Organic matter decays as low as 6-7°C, which means in the very cold weeks of the year, the pond becomes almost dormant and you can almost leave it alone. However, this winter has been very different. As I said before, the average temperature for December was 8°C… an ideal temperature for organic matter to decay without any competition creating sludge that builds up into an anaerobic environment to emit toxic gases such as hydrogen sulphide.

To add insult to injury, this winter’s been one of the wettest (and probably windiest) on record as well. Gale force winds have distributed a veritable smorgasbord of organic detritus around our gardens and some of it will have inevitably found a home in your pond.  High levels of rainwater, which is packed full of nutrients such as sulphur (think acid rain) and minerals provides a readily available (and this year plentiful) supply of nutrients to help organic matter decay. Consider how much better your plants grow when fed with rain rather than tap water! Or how when you collect rainwater in a water butt, invariably there will be a layer of algae over the top. The ‘bad’ bacteria in the pond thrive off this free buffet of nutrients, which only speeds up the decaying process and helps generate sludge.

So we have in essence the makings of a ‘perfect storm’. Lots of organics and nutrients being added to the pond, mild temperatures of around 8°C aiding decay and the fact that almost all traditional pond treatments are only effective from above 10-12°C.




This is why you can expect to see some real problems when spring eventually starts.

There are a few tried and tested methods of reducing the impact of green water, sludge and other algae problems in spring –

  • Physically removing as much sludge and organic matter from your pond – You can do this with a net, bucket or even with your bare hands but it’s not always practical.
  • Keep your filters clean – so you can catch as much organics in the water column as possible
  • Add plants – In a natural pond, plants will absorb a lot of the bad nutrients, but they can’t cure the issue and too many and you can’t see your fish!
  • Add plenty of task specific bacteria at the start of spring – Providing the bacteria in question is safe in large amounts, add a double or triple dose for the first few times in spring. Bacteria grow logarithmically – 1 becomes 2, 2 becomes 4, 4 becomes 8 – so the more you add the quicker the results.
  • Avoid adding any materials that can act as a nutrient to the ‘bad’ bacteria – with the high organic loadings the last thing you want to do is add a nutrient.

Have pond treatments kept up with our evolving climate?

Bacteria can be genetically modified (although there are ethical and moral question marks with this) but it’s far more common that new strains are discovered in natural occurring environments. In many ways it’s a game of chance, thousands of strains can be examined without finding anything that can improve on the strains you already have. This means that when a new strain is discovered it can be a big deal.

In late 2013, a strain of bacteria was sampled in a stream in Pennsylvania. Like many others it was catalogued and its characteristics examined and it showed signs of very good activity at low temperatures. In fact, it showed the same activity at 4°C as similar bacteria do at 10-12°C. It was so unique that the unusual step was taken to patent it!

Its natural environment was in water which made it incredibly suited for water treatments and was very active in breaking down organic waste, therefore just what you would want in a bacterial based pond water treatment.

This activity means that it’s food source are the same organics that create problems in your ponds and also provides a stable and continued treatment even during temperature spikes. Why you may ask is this important? Well imagine going for a run. It’s much easier to run for longer and with less effort if you keep a rhythm, rather than stopping at traffic lights, crossing the road or opening a gate to a field. Well, it’s the same principle for bacteria – In spring we see periods of really warm weather (24°C on one day in May 2015) which raises the water temperature in our ponds above the 10-12°C allowing traditional bacterial strains to become active, but periods of cold weather stops any activity. In fact the mean averages in the UK last year were; March – 5.5°C, April – 7.9°C and May – 9.6°C!. For the best bacterial activity you want the bacteria to concentrate on digesting organic matter rather than wasting energy stopping and starting due to temperature fluctuations, as they become much less effective.


Thermometre graphic


These new low temperature strains look to be the ideal answer as they provide you the pond owner with more constant and reliable bacterial activity much later into the year, and arguably more importantly much earlier in the year to tackle the inevitable build-up of organic matter that the warmer and wetter winters are bringing.

Bio8 Ltd exclusively manufacture the new Envii Pond Range which incorporates unique patent pending bacterial strains that are fully active at temperatures as low as 4°C and more information can be found at www.bio8.co.uk or contacting them directly on 01246 240880.



6 Tips To Prepare Your Pond For Spring

Remove debris 

Use a net or pond vacuum to clean the debris from the top of the pond. Any organic material left in the pond will decay and cause algae problems like green water and sludge. Removing it is the first line of defence against algae problems. It’s also worth clearing the surrounding area to prevent anything blowing into the pond.

Move fish back into the pond 

If you’ve moved your fish into a temporary tank during the winter, now is the time to get them back in the pond. It’s important to ensure the temperature of the tank is within 1°C of the pond temperature.

Clip back and trim plants 

Spring is the best time to have a general tidy up of the pond area. Overgrowth can be a large factor in an imbalance in the pond system.

Feed fish 

You can start feeding your fish again at temperatures of 10°C and higher.

Start treating your pond 

The earlier you can start treating your pond the better. Envii’s pond products work as low as 4°C which means you can get started earlier in the spring and treat later into the autumn. Giving the bacteria longer to establish will greatly increase the chances of keeping your pond clear and healthy. Click here for more information.

Clean your filters 

Most bacterial water treatments will dislodge any algae or sludge and it will get sucked into the filter. If the filter gets clogged it will stop filtering the water and become completely useless. It’s important to clean them regularly for water treatments to work efficiently.

Thanks for reading

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