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Biofilters need lots and lots of oxygen ... This might sound strange but it is true as I will explain. However before I do I would like to discuss oxygen in terms of good and effective pond keeping. You may know that trout and salmon can only breed in running water such as streams or rivers. You will also know that these particular fish make hazardous journeys up to the very top parts of river systems. The essential reason for these long perilous journeys to these headwaters are that the water is: cool, pristine, clear, fast running, shallow, full of gravel ... ie the oxygen levels are high and suitable for breeding. koi pond filters
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Fish food for ponds .. In the early days of artificial pond and fish keeping the only food available to buy was food made to feed trout and similar farmed fish. The trouble was this type of food was first of all not formulated for feeding to carp types (koi and goldfish) and the food sank to the bottom immediately. Now this sinking factor was not all that serious since carp are natural bottom feeders but fish pond owners like to see their fish eating (don't we all) so the market need for a floating form of fish food was born ... forget flaked fish food used in aquariums and mainly which is ridiculously expensive. Tetra, a German company, accepted the challenge and I believe created the first commercially available fish food stick that reliably floated. On the back of excellent technology and marketing they established a multinational market that thrives still today. http://www.practical-water-gardens.com/artfishfoodsticks.htm pond pump selection
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Oygenators, pond plants ... All plants that live happily under water can be described as oxygenators. Out of these plants there are bound to be one or two that are the best for the job we need them to do. There is no doubt they are specialised. Roots tend to be merely for anchorage and the nutrition absorption and gaseous exchange occurs on the surface of the plant directly to each cell. The plant therefore has very thin walls and thin leaves to allow this to happen. This makes the plants floppy, which in fact becomes an advantage under water as they are able to bend with the eddies in the water. Two plants that have made this a real speciality and thrive in streams are Water Crowfoot, the true Water Buttercup (Ranunculus aquatalis) and Curly Pond Weed (Potamageton crispus). all about garden pond plants
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Biofilters and bacteria starters ... Some manufacturers claim that their bio starters contain Nitrosomonas and Nitrobacter. Now it is extremely diffiult to freeze dry and keep alive such sensitive bacteria so any claim should be backed up by definitive proof of the fact that such powders do contain those bacteria and they are in a form that will work. If there was a viable population when packed then the question to be asked is are the bacteria still viable ater "x" weeks on a shelf in non-controlled conditions. If the concoction does not contain Nitrosomonas and Nitrobacter then what value is it anyway? biological pond filters
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Oxygen in ponds ... Aeration of ponds ... Aeration of pond water achieves two things both of which are very good for pond water and the fish: Oxygen levels increase and carbon dioxide is "blown" out of the water and this tends to push up pH levels. Aeration also protects against those algae blooms and their dying - when they die they rot and release carbon dioxide by using up the oxygen resource in the water. In summary it is difficult to over-aerate a pond and aeration has all round advantages in a pond. The downside is the cost of a special aerating pump. All top koi keepers' ponds bubble with air as do their filters. filters and uv light
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Measuring pond volume using science .. this is worth pointing out for its simple but brilliant bit of chemistry. Once more I am grateful to a reader for pointing this out to me. This method depends upon a pondkeeper using salt in the pond water. By measuring the salt concentration in the pond water before and after adding a known amount (lbs) of salt to the pond it is possible to calculate the pond volume very accurately and easily assuming the salt hydrometer is also accurate. If you want to know more e mail me and I will send you a calculator pond pump head or pressure
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Do not feed more food than what you fish can eat in about 5 minutes. Remember your fish can survive almost indefinitely without food from you. Any excess food should be removed ... there are even devices sold that confine the food to an area to enable excess to be removed. As water temperatures increase the appetites of fish increase and the oxygen holding capacity of water decreases. Getting the balance right between feeding and overfeeding is important. If you find your fish gasping at the surface and are not sure why start changing portions of the water immediately. Stop feeding. water gardens, pond keeping
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Pumps ... most small submersible pumps have impellors designed to turn in a single direction. This type normally have curved rotor blades for improved pumping efficiency. To make sure they do not start up in the wrong direction when you switch them on this type of rotor can only be turned by hand about 3/4 of a turn before it comes to a deliberate stop. If and when your pump suddenly stops pumping this is the first and easiest test to do to find out if the rotor needs changing or if something more serious is wrong with your pump. If the blades go round and round and round you probably just need a new rotor. pond pump flow rates
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Pumps ... most small submersible pumps have impellors designed to turn in a single direction. This type normally have curved rotor blades for improved pumping efficiency. To make sure they do not start up in the wrong direction when you switch them on this type of rotor can only be turned by hand about 3/4 of a turn before it comes to a deliberate stop. If and when your pump suddenly stops pumping this is the first and easiest test to do to find out if the rotor needs changing or if something more serious is wrong with your pump. If the blades go round and round and round you probably just need a new rotor. pond pump flow rates
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Water has a maximum density at 4 degrees centigrade, about 39 degrees Fahrenheit so when a pond has a frozen surface the water at the bottom of the pond is normally at this temperature (higher density water sinks). Only in extremes of climate or in very shallow ponds therefore does a pond completely freeze solid. As the ice gets thicker form the top downwards then the water becomes even more insulated and will tend to stick at 4 degrees or 39 Fahrenheit. pond pump flow rates
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Never switch off your pond pump for more
than about 60 minutes
Make sure the delivery pipe from the
pond pump is not kinked
Must the UV be placed before the
biofilter?
A waterfall adds oxygen to a pond by
creating a large surface area
Submersible pond pumps can operate
against a closed valve
It is a good idea to pump out about 10%
of your pond water
Lighting in and around ponds creates a
brand new dimension
Sick and tired of looking at debris on
the bottom of your pond?
Do not feed more food than what you fish
can eat
Pond Links and Tips
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