The next question is; My pond is very clear, but my fish are still dying, why? Although drinking water may look and smell good as well as taste good, there can still be toxic cancer-causing chemicals in it that is odorless, tasteless and colorless.
Ammonia, nitrate and nitrite are extremely harmful to your fish so you should keep test kits on hand and test the water on a regular basis. These substances in high levels will kill your fish and because they are dissolved in water, they are not detectable by the clarity of the water. They will start to tear down the fishes immune system.
What kind of filter should I use? It is recommended for a pond over 1,000 gallons, to use a pressurized biological filter that can be back washed. A good filter is the Aqua Ultraviolet Ultima II, which you can find at most pond suppliers. They have filters for ponds from 1,000 to 10,000 gallons.
The gravity flow and up flow filters are not recommended because they will need regular cleaning and it is a very nasty job as the filter media gets packed with nasty, putrid fish waste and decaying pond scum. When handling the filter to clean it, you will have 1/16 inch white fecal-eating worms crawling on your hands and arms and the horrid smell will burn your eyes and lungs! as per www.articlesfactory.com
These filters cost pennies to make, but cost a fortune, plus it requires a lot of time to maintain it. A pressurized filter is extremely easy to use as the turn of a handle for 2 or 3 minutes will clean the filter and you`re done! Then the waste water can be used to water your plants, using a discharge hose, because that nasty, smelly, brown water is loaded with nitrogen and is better than Miracle Grow!
Douglas C. Hoover reported using an Ultima II for his 6,000 gallon pond for 8 years and it still works as good as the day it was put in. Hoover is CEO of Aquamedia Corp. and has been a Master Waterfall Builder for over 30 years. For more info, you can visit: www.askdoughoover.com
Image source en.wikipedia.org used with permission
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