The Koi are considered as one of the most beautiful and colorful pets that owners can have in their outdoor ponds, but keeping them in good health requires the basic knowledge about the fish itself and outdoor ponds, plus a few important supplies.

First, you're going to need a filtration system that'll maintain the water quality of your pond. There are two classes of filters, the mechanical and the biological. The function of the filter is to remove those unwanted pollutants which will decrease illnesses that may affect your Koi.

Now, the only way for the filtration system to work in processing the water is when the water will move, that's why a pump is needed (another important factor that'll promote your pond's health). Although you can have a waterfall or fountain in the pond to aid water movement, they should not completely replace the pump, as they don't have the necessary strength to help with the filtration of the pond.

The advantage of having a fountain in your pond is that it will give you feeling of tranquility, which will stir the water, drown the unwanted noise, and give oxygen to your pond.

Other pond supplies that aren't needed on a daily basis should still be kept available when the need for it arises. The dechlorinator is a device used to replenish the water level of your pond with tap water (but you need to eliminate and remove the harmful chemicals of the tap water first).

The pH and nitrate levels of the water should be checked on a weekly basis with the use of test kits available in local pet stores. You can add pond salt and baking soda to the water in order to regulate the nitrate and pH levels of the water when the test will show that the levels of chemicals are off.

Food is the most important supply for your pets. Although they eat a variety of natural foods, it is still necessary for you to keep a basic food source ready at all times. The fish can eat out of their owner's hand, so various snacks and treats can be offered to your them.

Also, look out for those predators. These are the herons, kingfishers, cats, foxes, badgers and raccoons. A good pond design can keep them safe. Pond waters should be deep enough to prevent heron attacks. You can also build overhangs on your pond's side in order to prevent these predators from reaching the water.

Another way of doing this is by placing the pond under a tree, covering the aerial view of birds. Nets can also be placed entirely over the pond, which will help prevent debris like leaves from falling into the pond and protects your fish from predators.

Your fish requires a little bit of effort from your part as the owner as you take care of them when you set up your own pond and taking into consideration all of the things you'll need for it. But these are truly magnificent and elegant pets that are really worth your time and effort!