Algae & ponds
Ponds & filters
Ponds & water gardens
Pond & fountain pumps
Pond liner sizes
Oase Pondovac 3
Hozelock Cascade pumps
Oase pressurised filters
Maximus fountain pumps
Olympus Filter Pumps
Quick Pond Keeping Answers to Common Water Gardening Questions
Excellent biofiltration and
high quality food will generally result in few problems with bacterial
diseases. In many warmer countries especially, Aeromonas and Pseudomonas bacteria cause
potentially fatal ulcer and dropsy diseases. Once the
disease is established it is very difficult to eradicate and whole collections
of expensive koi can be wiped out. Look for pond additives that work on the
basis of competitive exclusion ... these are microbial products that
literally starve Aeromonas and Pseudomonas type bacteria out of existence.
If you cannot run your pond waterfall pump at night
because it is too noisy or if you want to save energy make sure you install
a second smaller pump ensuring water is flowing through the biofilter. The bacteria in a
pond biofilter die
if they are starved of oxygen for more than 5 hours. This of course will happen
if the pond pump
is switched off overnight. Once dead the bacteria take about 5 weeks to
become a large enough colony to be totally viable again. By installing a low cost efficient pump such as a
Hozelock Cascade the filter is kept alive due to the flow of water. This
arrangement can allow you to actually save a lot on
There are a number of possible reasons for this but the most important is that
the pond probably does not have an ultra violet light installed since most
murky ponds are caused by suspended algae seeking light and these rise to
the surface during daylight to catch as much as possible for the sun's rays
to allow photosynthesis to take place. ... the pond is not dirty it is just
that the top few inches are opaque due to the massive quantity of algae. The
solution here is to get an UVC.
You will never regret it. If you believe the water is dirty because of
suspended solids then consider ...
The mechanical section of the filter is not doing a good job
and somehow solids that do not easily settle are getting into the pond.
Alternatively you might have your fish rummaging in your pond plant
containers and continuously disturbing the soil ... but this would rarely
cause permanent cloudiness in a pond. You need to check
if water is able to by-pass the mechanical section of your pond filter - for
example are there gaps around the sponges or are there holes in the sponges.
Even this situation is unusual but could be a real problem in ponds with
very strong pumps and ponds that also have lots of dirt on the bottom. The
combination of these 2 points could create permanently cloudy pond water.
But our bet is on the UVC (ultra
violet light clarifier) not working properly.
If you suspect your pond filter is getting to
biological filtration limit then add more biomedia. You don't have to go
and buy a new filter.
Replace your present filter media of plastic balls, tubes, and other devices by
Alfagrog or something similar. Alfagrog is a lightweight porous inert ceramic filter medium
specially made in the UK for biofiltration (used extensively in fish
farming). One litre (having a surface area of between 40 and 100 sq metres
per litre) of Alfagrog is sufficient for a biofilter handling 1,500 litres
of pond water. Each piece of Alfagrog is full of tiny holes.
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