We offer FREE P&P when you spend over £60 or more on products.
Garden supplies will normally be delivered within the time period stated against each product as detailed above.
Unfortunately, we are unable to deliver garden supplies to the following postcode locations:
BT, GY, HS, IM, JE, ZE, TR21, TR22, TR23, TR24, TR25, KW, IV, PA20-38, PA41-49, PA60-78, AB31-38, AB40-56, PH4-44, PH49-50, PO30-PO41
Please see our Delivery / P&P page for further details.
Frequently Asked QuestionsOxygen Levels
It is important to have
enough oxygen in the water when Thompson & Morgan Pond Wizard is
used as it contains aerobic micro-organisms. If it is used in a pond
without sufficient oxygen, its effectiveness will be reduced. It could
also deprive fish of oxygen. If there is any doubt about the oxygen
levels then start with a reduced application and watch the fish
carefully. Then continue to add the full amount over a few days. If the
fish move to the surface, they are not receiving enough oxygen and
aeration will be required immediately. Aeration equipment is widely
available from aquatic retailers and on the internet.
What are the
benefits of using Pond Wizard in ponds?
Pond Wizard will give three basic
benefits to the pond keeper. It will reduce and remove nutrients
(nitrate and phosphate) in the pond water that feed algae. As a result,
blanketweed (string algae) and algae bloom (green water) die of
starvation. Secondly, Pond Wizard will digest waste organic matter in
the pond. Thirdly, Pond Wizard will improve the health, growth and
disease resistance of fish.
Should I use Pond Wizard to remove
blanketweed and algae bloom?
For all general garden ponds in which
organic waste arises from fish excrement, from surplus food or from wind
carried leaves and grasses, we recommend Pond Wizard.
How is Pond Wizard applied?
Pond Wizard is a dry powder. We advise that the appropriate amount be mixed
into water and allowed to stand for a few hours. The water should be
taken from the pond. Ideally it should be mixed in the morning and
applied to the pond in the evening. Also some air should be introduced
into the solution via the use of an air stone or regular whisking. Never
leave the solution for more than 24 hours before applying to the pond.
Should Pond Wizard be put into the pond or into the filter?
put the solution of Pond Wizard directly into the pond although some put
the concentrated solution directly into the filter.
How frequently should Pond Wizard be used and how long does it last in the pond?
Some of our customers make one application and then see no more blanketweed for
over one full year. Others keep blanketweed at bay for a few months
with one application. However, a minority of pondkeepers need more than
one dose to suppress blanketweed. Remember, every pond is different but
we recommend regular maintenance doses.
Should the pondkeeper apply
maintenance doses of Pond Wizard?
Yes. It makes sense to consider the
application of maintenance doses of Pond Wizard. However, unlike
recommendations for some other products, we do not suggest what these
should be. We advise that nitrate levels should be regularly checked and
used as a guide as to when more Pond Wizard should be added.
How quickly does Pond Wizard work?
people see blanketweed dying back within 4 to 5 days. For others it
does take longer. For most people it occurs within about 3 weeks. If,
after this time, no noticeable change has taken place, then apply a
What happens as the Pond Wizard starts to work?
colour of the blanketweed starts to change from green towards brown. It
also becomes brittle and pieces break off. Some people have reported
that pH levels in the pondwater increase as the blanketweed dies.
the blanketweed be removed before applying Pond Wizard?
We would advise
that as much of the blanketweed as possible should be wound out before
the Pond Wizard is applied. This will reduce the need to clean up weed
debris after it has died. It will also keep better control over rising
Is Pond Wizard safe for fish?
Yes, Pond Wizard is safe for
fish. It was initially formulated for use in commercial fish farming to
improve the growth, health and disease resistance of the fish. The fact
that it suppressed algae growth by removing the nutrients on which algae
feed turned out to be a bonus.
What effect has Pond Wizard on the
health of fish?
Pond Wizard improves the health of fish. They eat better
and grow quicker. They are less prone to fungal and bacterial diseases.
Many of our customers have referred to their fish becoming 'more
How does Pond Wizard improve the health and disease resistance
of the fish?
The reason why a fish succumbs to a bacterial or fungal
disease is the bacteria or fungi that form the disease have become
predominant. If the pond system were kept in better balance and the
disease microbes had greater competition, then they would not become
predominant and form the disease. The micro-organisms in Pond Wizard are
present in huge numbers and in a number of different species. They do
not remove the disease forming species but compete with them for food
and space and keep their numbers down so they do not take over.
does Pond Wizard do to aeromonas?
Aeromonas bacteria, which can cause
severe problems to the health of fish, particularly in koi ponds, is
kept at bay in the same way as other pathogenic microbes by the
competitive action of the micro-organisms in Pond Wizard.
Is Pond Wizard
safe for other wildlife?
Yes, there is no problem for other wildlife, eg
newts and, frogs.
Does Pond Wizard harm plants?
Wizard does no harm to plants. However, because Pond Wizard reduces
nitrate levels in the water, plants may grow less strongly. For example,
leaves of, say, water lilies grow less vigorously but the bonus is that
they should flower better.
Does the Pond Wizard include chemicals?
The Pond Wizard products are micro-organism based and the method of
operation is biological and not chemical. Pond Wizard contains a number
of species of micro-organism. In addition there are support nutrients
which are included in the mixes. These include humic and fulvic acids
formed in nature from vegetation and amino acids that are the building
blocks of proteins.
What about the use of salt in koi ponds?
There is some
evidence that using salt can inhibit the effect of Pond Wizard. We have
had reported by one customer that salt levels of over half an ounce per
gallon can affect Pond Wizard. We remain unsure about this.
Magnetic blanketweed control gadgets do not affect the microbes
in Pond Wizard.
Can I use Pond Wizard with chemicals?
chemical that knocks back the microbes in a filter system will also
knock back the microbes in our Pond Wizard products. Wait until these
chemicals have dissipated. An example of such a chemical is potassium
permanganate. However, other chemicals that are known not to affect
microbes can be used at the same time as Pond Wizard. Many people use
branded herbicides to remove blanketweed and these types of products
would not normally lower the efficacy of Pond Wizard. However, it still
would be best to leave a gap of a few days between using any injurious
chemical and using Pond Wizard.
How do water changes affect the effectiveness of Pond Wizard?
as water is removed from a pond, the microbes in that water will be
lost. However, because micro-organisms are always growing and
multiplying as long as there is food and space available, those that
remain in the pond will increase in numbers until a microbial balance is
reached. One customer told us that he lost approximately 85% of his
water shortly after applying Pond Wizard. Our product went on to clear
What does Pond Wizard do to the micro-organisms in the
Pond Wizard helps to maintain an efficient biological filter as
it contains microbes that are used in the nitrifying process in the
Is Pond Wizard temperature dependent?
Yes, Pond Wizard works best
in water temperatures above about 10°C (50°F). However, it will work in
lower temperatures but more sluggishly.
Can Pond Wizard be overdosed?
is no problem with overdosing Pond Wizard. Many people put in increased
amounts to speed things up. It is organic and not a chemical.
effect does Pond Wizard have on nitrate and phosphate?
removes the nitrate arising from the biological filter. Nitrate is
formed from the conversion of nitrite that in turn has be oxidised from
ammonia. Nitrate can be reduced to zero within a few days and kept at
zero by the action of the microbes in Pond Wizard. Phosphate is also
reduced but usually much more slowly. When the nitrate level in the
pondwater is zero or very, very low there is no food available for the
algae - either blanketweed or algae bloom.
Do pH levels affect Pond Wizard?
We are finding that, in high pH water, Pond Wizard seems to take longer to work.
What is the effect of UV light and UV filters of Pond Wizard?
is widely accepted that ultra violet light from the sky does destroy
bacteria. In order to protect the bacteria in Pond Wizard, we recommend
that the solution of the product be applied to the pond in the evening,
during low daylight levels followed by a period of darkness. We also
recommended that UV filters be turned off as the UV light from them
again could affect the efficacy of the product. However, we now believe
that UV filters can be left on as the intensity of the emitted light is
generally not enough to kill bacteria. UV lights are primarily used to
agglomerate algae bloom, the clumps of which are caught up in the
physical filter. Pond Wizard removes the nutrients on which both
blanketweed and algae bloom live, so there should be no need to use a UV
filter once the nitrate levels have been taken to zero. It is still
advisable to apply the product to the pond in the evening as the
intensity of UV from daylight, even on bright cloudy is considerably
greater than the UV from pond filters.
What is the shelf life of Pond Wizard?
Pond Wizard microbial products are purposely put out as soluble
powders. The Pond Wizard range, unlike microbial products in liquid
form, have unlimited shelf lives if kept dry. There is a tendency for
the powder to solidify over time. There is no problem with this. Liquid
microbial products deteriorate over time. The end user of a liquid
product is usually uncertain of its shelf life. Also, the end user might
not know how long it has been in the supply chain since manufacture.
Total waste of money - useless
By F Sawer 12-08-2014
I purchased 2 packs a few weeks ago because I had been told it was good. Despite now treating the pond twice it has made absolutely no difference at all. The green dies off for a few days and then return again! £30 - a complete waste. Will go back to my previous treatment. Have contacted customer service but no reply.
Thank you for your review. I am very sorry to hear of your disappointment with your recent purchase. If you would like to contact our Customer care team on email@example.com, one of our agents will be happy to investigate this matter further.
You will be redirected to login/registration page to post your review.
Reviews are subjected to approval.