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I received a very interesting question this week. The question was what is difference between a biofilter and the powder she throws into her pond every week as recommended by a dealer. The powder she was referring to is called a bio-starter or bacteria starter. These powder products are offered by many companies and are probably worthless in practice. The powder is supposed to be a mixture of naturally occurring bacteria that are also found in biofilters. The types of bacteria required for effective biofiltration convert ammonia to nitrites and then to nitrates. All fish ponds need a biofilter. This is non-negotiable. pond biofilters
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It is a good idea to pump out about 10% of your pond water every month or even weekly if you have lots of fish and replenish with tap water. The reason is that nitrate levels slowly build up and can reach a level that is too high for the fish in the pond to tolerate easily. The easiest way to arrange this is to place a valve and "Y" or "T" piece into the pump line then all you need to do is connect a temporary pipe to the valve and lead the pipe to a spot in your garden - pond water makes for a good garden fertilizer. fiberglass water features
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Vegetable BioFilters ... Aquatic Plants For Gold Fish and Koi Ponds The idea of using vegetable filters (also called veggie filters is an area where plants are deliberately grown en masse) to remove algae for Nitrate control and green water control is not new by any means. It has found use in systems where people do not want or cannot afford UV systems. Concerns expressed about vegetable filters include blocking of pump impellers by stray roots and leaves. Some plants would be worse than others ... eg water hyacinth. Despite this they are excellent nitrogen removers. An ideal plant to use is Azolla also called Fairy Moss. It grows extremely quickly and is capable of removing large amounts of nitrogen and of course carbon through photosynthesis. It is also easy to remove simply by netting in the event it over-runs the filter area. http://www.pond-solutions.co.uk/pjmvegfilter.htm water gardens and pond filters
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Ponds & algae concerns ... At night, both algae and fish consume oxygen from and exhale carbon dioxide into the system. Algae compete with the fish for available oxygen in the water. A potentially serious impact of an algae bloom is the risk of an "algae crash" triggered by temperature or barometric pressure. When an algae bloom collapses, dead algae cells settle to the bottom of the pond, adding to the decomposing sediments oxygen demand. As the dead algae cells rupture, they release organic nitrogen and phosphorous back into the water, adding to the systems nutrient load. pond algae
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Pond pumps and running costs. Before buying any pump check what the running cost will be. Look on pump box and if you can find watts consumed multiply this by 8.76 and you will get units (kWhrs) of electricity consumed every year by your pump. Find cost per unit and you can work out running cost of the pump. If you can only see amps on box you can work out watts as follows: amps x voltage of mains supply = watts. Once again multiply by 8.76 to get annual cost. use this figure to compare costs of 2 different pumps since running cost is generally far more important than the purchase cost. waterfall pumps
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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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Oxygen in ponds ... On occasions fish in ponds with no fountains or waterfalls may look listless in winter due to carbon dioxide levels being excessive but the problem quickly sorts itself out when windy and bright weather returns. In summer water can hold much less oxygen and the animal and plant life (algae) is also thriving due to higher temperatures along with more nutrients in the water associated with feeding fish. The living organisms are therefore emitting more carbon dioxide in a situation of potentially disastrously low oxygen levels . Fish may then die from suffocation. uv maintenance, lamp changes
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Ponds & algae concerns ...Fish ponds without adequate plantings are most susceptible to algae bloom problems. These ponds are usually well stocked with overfed fish. The absence of aquatic plants eliminates competition with algae for available nutrients in the pond water. Practical fish stocking densities and feeding must be managed closely. UV sterilization is a proven method for controlling waterborne algae. Combining sterilization with adequate biofiltration and operating the two properly is most effective in eliminating algae blooms and maintaining clear water. filters and uv light
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Pond building materials ... Specially formulated flexible plastic non preformed pond liners are also suitable. Look for good guarantee. Do not use ordinary plain black sheeting such as that used by builders. Always source from reputable supplier. For larger ponds (above 600 litres or about 120 gallons) garden pond liners should be installed - preformed liner ponds become too expensive. Rubber (butyl or EPDM) is the material of choice. You can go as big as you like. Even small reservoirs use this type of material. Liner ponds are ideal for water lily ponds. For ponds below this size it would be very wise to choose from a range of preformed pond liners or preformed garden ponds as they are better known. A word of warning: Do not let your dogs swim in water where garden pond liners are used non preformed pond liners are easily damaged by their claws. If you do have dogs go for fibreglass preformed garden ponds. http://www.practical-water-gardens.com/pondliners.htm fiberglass water features
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Pond pump don't stop for more than about 60 minutes because,if you keep fish, the biofilter is starved of oxygen. For this reason two smaller pond pumps are often a better choice than a single larger pond pump. The main reason for a biofilter in a pond is NOT to filter the solids out of the water. It is to purify the water by removing offending chemicals. These chemicals are actually produced by the fish themselves by virtue of their normal breathing, eating and toilet behavior. Biofilters need a continuous supply of oxygen sourced from that dissolved in circulating pond water. Beware low oxygen levels in summer. all about pond pumps
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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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