Water has a maximum density at 4 degrees centigrade, about 39 de

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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
Many people use salt in their ponds. I do not recommend it but the reason is to help prevent parasitic diseases that lead to complicated bacterial diseases. It is important not to overdose and if the intent is to remove parasites from individual fish then rather place the fish in another small temporary pond loaded with salt for a few minutes. Use about 2 lbs per 20 US gallons of pond water as a general treatment. As a short term soaking to treat individual fish use about 3 times as much salt as above. Adding pond start bacterial mixtures can do no harm especially at springtime. blanketweed in fish ponds
If you pond is losing water then do a quick check by shutting down the pump. If the level stops falling then the leak is outside the pond itself. If the level continues to fall then obviously the leak is inside the pond itself. When a constant level is reached then you know the leak is at that point where the surface remains level. Leaks from concrete ponds are notoriously difficult to repair and many sealants claim to do the job. In my experience fiberglass resins with glass fiber are best suited and it is worthwhile doing complete resurfacing job. sump pumps
A biofilter is absolutely essential if you want to keep fish in a pond. In my opinion it is cruel not to install a biofilter since without a biofilter the fish will live in a potentially highly toxic environment. A biofilter will automatically start itself up once fish are introduced into a pond. Nitrosomonas and Nitrobacter are naturally occurring and will rapidly find their own way into the filter. They then need oxygen from circulating water as well as excreted ammonia from the fish (this occurs naturally) to thrive and multiply. It will take some considerable time for the biofilter to reach maturity. pond filters
A pond's ability to hold koi should not merely be regarded as a function of its physical ability to hold koi, (ie, like storing groceries in a cupboard). A koi pond's stocking rate is determined by the filter's ability to process and breakdown the waste that koi produce. To be more precise, we need to be sure we do not overstock our filter, rather than our pond. This does not merely focus on the biological activity of a filter, but also it's ability to remove solids at the required turnover rate. A pond's water quality management system would also need to provide sufficient aeration for a given stocking rate. http://www.practical-water-gardens.com/benoverstock.htm pond pump selection
If you are sick and tired of looking at debris on the bottom of your pond then consider buying an electrically operated vacuum cleaner. Just make sure that it is safe for pond use. OASE make the one that is best known. The latest version is Pondovac 2. For people who do not like to get their hand too mucky when cleaning out a pond there are specially made long length gloves extending right to the shoulder. If the water is a little too cold then the fishermen amongst you could easily use those waders to enter the water if cleaning has to be done. fountain pumps
In winter make holes in the ice using a pan full of hot water to remove toxic gases. Do not break the ice - this is not good for the fish as you can probably imagine. These days there are low cost electrical heating devices that consume small amounts of power and maintain a "breathing hole" in the pond. pond pump curves
Save when you buy koi food or fish food. Check your koi fish food label. Do NOT waste money. Understand the specification on koi food and fish food packets and you will save considerable amounts of money and grow bigger koi fish more quickly. Do not believe everything you are told about koi food it might not be true. Check for yourself easily. Koi Food If a 5 kg bag of koi food contains 15% ash, 10% moisture and 3% fibre then 28% of the bags contents (amounting to a whopping 1.4 kg) is a total waste of money. http://www.practical-water-gardens.com/koifood.htm pond pump selection
Spring marginal plant favourites ... The Marsh Marigolds (Caltha palustris and all the species and varieties) are still at it. Brilliant. The Water Forgetmenot (Myosotis palustris) is also making waves of blue around the pond. Also there is the Golden Club (Oronitium aquaticum) and in the deep water The old South African stew ingredient, the Water Hawthorn, Aponogeton distachyos, is flowering its socks off. An amazing plants that comes up from unlimited stygian depths to perform at the most ludicrous times of the year. It still thinks its down in the Cape, nestled in the fynbos looking up at Table Mountain. where to buy pond plants
Use garden pond bottom waste on the compost heap. This organic matter is full of mainly anaerobic bacteria which will catalyze the composting process. Backflushings from the pond filter can be sprayed onto the lawn or garden as a source of nitrogen fertilizer. Use black or opaque pipes in your pond instead of transparent low cost plastic tubing. Since light cannot penetrate the black piping the algae growth inside the pipe will be very considerably reduced. This means less maintenance and also less expenditure on replacing transparent pipe when it becomes clogged with algae. submersible pumps

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