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4. Filtration

The balanced pond is every water gardener's dream. The balanced pond ecosystem is a delicate interaction among nutrient levels and the plants and animals that produce and utilize these nutrients. Excessive nutrients is caused by over fertilization and over population of fish and usually results in unsightly and unhealthy water.

These problems can be avoided with proper planning and sensible filtration. Water gardening is like any other form of gardening - it is just as much an art as a science. Many excellent products and filters are available to help water gardeners be more successful at keeping healthy, thriving plants and fish. It is possible to achieve a balanced pond with no filtration and nothing more than that perfect mix of plants, animals, and care - but this is the exception rather than the rule.

By following a few basic guidelines and by utilizing the most advanced state of the art products, from day one, the beginner can be much happier and successful. For those of you who have already started and been frustrated, it isn’t very hard to change that pea soup mess into something that will add to the beauty and value of your home and give you many hours of enjoyment. Filtration is a very important aspect of pond keeping and makes pond maintenance much easier.


4a. Why Filter?

• preventing cloudy water
• success in keeping a larger population of fish
• success in keeping a large fish population without the addition of plants, then you need a filter.


4b. Types of Filtration

Natural filtration

Although all forms of filtration are somewhat natural, the filtration we refer to is plant filtration. This is very important to the balanced pond. First, plants convert carbon dioxide wastes to oxygen. Secondly, plants perform a supplemental type of filtration. In heavily loaded Koi or fish ponds, plants help keep abundant fish nutrient waste in check and increase the efficiency of the system. In systems with large Koi, a small header pond containing either a balanced pond setup of plants or simply submerged plants and nutrient absorbing plants like water lettuce or water hyacinth makes an excellent natural filtration system. The header pond or plant filte is fed by a pump and filters from the upper pond which, in turn, drains into the lower pond.
TIP ! Remember submerged plants in all systems. They are barely visible and are one of the most valuable assets to proper pond balance and filtration. Use 6-10 stems per square foot of pond surface.


Mechanical filtration


This form of filtration is exactly what the name implies. It mechanically removes particles by simply straining them from the water onto a medium which can be removed from the system. This is one form of filtration that should be incorporated into all good filtration systems. Mechanical filtration also is important before fountain discharges to remove silt and other debris. Mechanical filtration can be achieved by using filters on the inlet side of the pump or on the outlet side of the pump in the form of external filters. Well designed external filters of the trickle type or flow-through type incorporate an easily cleaned pre-filter

Biological filtration


This method relies on the biological activity of bacteria to remove pollutants. These bacteria utilize fish and animal waste and turn it into plant nutrients. Biological filtration occurs naturally in the pond on all surfaces but its efficiency is significantly increased by advanced trickle filters. These filters result in water quality far superior to any other form of biological filtration.

Chemical filtration


As the name implies, chemical products like activated carbon, zeolites, and resins actually bind certain pollutants for the removal from the water. This form of filtration is important for removing proteins, pesticides, metals, medications and other natural and man-made pollutants that can disrupt your pond and kill your livestock.


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