Aquascape and similar ponder owners POST 2
Xref: news7 rec.ponds:100360
Here is the reprint of an article in Koi USA on this subject: Beware the Stagnation Zone in Your Pond Gravel and Rock Form Dead Zone by Joseph F. Cuny It has been brought to my attention that some pond builders (both Koi and water garden) apparently are not familiar with basic pond design. In particular, I am referring to the use of gravel and rock inside the pond. As anyone who has been a pond keeper for a few years knows, that is a real no no. Possibly this practice is a direct carryover from the aquarium 'under gravel' filters, but it is a wrong application of the concept. The problem is that the gravel and rock form a dead zone, more appropriately called a stagnation zone. Whether the pond has fish in it or only plants, there are all kinds of organic material produced in the pond. This organic material gets trapped in the stagnation zone and guess what happens? It stagnates! Since the water does not circulate very well in this zone, the water is deficient in dissolved oxygen, and the organics are processed anaerobically. In other words, the organic material rots or putrefies. The end result of such putrefaction is the production of noxious gases and disease organisms. I do not know what effect these would have on plants but they are deadly on fish and are very unaesthetic. In time such a pond would smell like a cesspool! This is exactly what happens in an aquarium if the under gravel filter is not cleaned regularly. Even with oxygenated water flowing through such a filter, there are dead spots where the water does not flow and these have to be cleaned, usually with some type of vacuum or siphon system. If it is necessary to put rocks on the bottom of a pond, possibly to simulate a natural stream, they should be well separated and bedded in mortar to allow flow around them and to eliminate pockets where debris could accumulate. The amount of work necessary to properly imbed gravel probably eliminates the use of gravel. If it is thought that the gravel will function as a filter, it should be placed such that it can be fairly easily cleaned. Despite claims made by various people, all filters must be cleaned. The only possible exception is the trickling filter type that is self cleaning, but in the process dumps the waste into the following stage where it must be captured and disposed of. I have seen gravel filters built into a sump in the bottom of a pond. Such a filter is almost impossible to clean, and the resulting pond does not provide a healthy environment for the fish. With such a filter in a water garden, I would expect the same type of problems. I realize that many people believe that the root system of the plants provides space for the organisms that degrade the organic material, but this is not a suitable filter except for those organics that are soluble. Even these, when aerobically digested, result in material that falls to the bottom where it joins the leaves, stems, decaying roots, and so forth and then putrefies. Joe Cuny is a founding editor and contributes to KOI USA since its beginning, over 20 years ago. This article first appeared in the March/April 1999 KOI USA. Some food for thought.. Happy ponding, Greg "~ jan" wrote in message s.com... Yes, that's what I believe too. Though I believe his plan is to maintain it himself, he is a retired gent.... a healthy retired gent, but still, once one gets in those upper years (you know, like above 40) one never knows what will strike one down temporarily or slow one down permanently. This gentleman is at least in his late 60s. ~ jan On Thu, 06 Mar 2003 16:35:22 GMT, Theron wrote: In the case of the Aquascape system, the nursery will make most of its money from the sale of the weekly/monthly chemical additions and the once a year cleaning of the rocks. A pond of this kind is a cash cow for maintanance as long as the pond owner has it, and has the installer maintain it. Theron See my ponds and filter design: http://users.owt.com/jjspond/ ~Keep 'em Wet!~ Tri-Cities WA Zone 7a To e-mail see website |
Aquascape and similar ponder owners POST 2
We had a Aquascape system installed in September. After the initial leaking
problem, everything has been fine. Ann |
Aquascape and similar ponder owners POST 2
Ann, at the risk of being "Cassandra", your pond is new, not a year old yet.
Stay in touch with the folks on this NG: they'll be happy to help you when you need it. But the AS design sure looks nice, doesn't it??? Lee "Annb860" wrote in message ... We had a Aquascape system installed in September. After the initial leaking problem, everything has been fine. Ann |
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