What I always tell a new fish keeper, is to remember that you are not a fish keeper, but rather a water keeper. Keep you water healthy and the water will do the rest. Unlike in nature where water is constantly being replaced, ponds are a closed living entity and should be treated as such. 


Waste from the fish causes Ammonia in your pond that is toxic to your fish. The Bio filter grows bacteria then converts the ammonia into nitrites and then nitrites to nitrates. Nitrates are harmless to freshwater fish and is a great source of food for water plants. It is always best to have clean filtered water free of solids flowing through your bio filter. Some bio filter systems for small ponds have built in mechanical filters before the biological stage. On larger ponds a sand filter is required before the bio filter. 


Most ponds are in direct sunlight and the pond water tends to turn green. Green water is not necessarily “bad” water, it is just not visually pleasing. In most cases a UV sterilizer is used to kill the algae, thus preventing your water from turning green. UV light sizes go according to the size of your pond and the size of your pump. 

Depending on your needs we will advise you on which of the following examples of products you will require. Please note that we use one or more or other items not displayed to design a suitable system for your individual needs.

8W 5L Gravity Bio Filter with UV Sterilizer            

Bio Filter Balls   

UV Sterilizers / Clarifiers – Stainless Steel also available

15L Pressure  Bio Filter

Foam Sets for Bio Filters

Replacement UV Tubes

Mechanical Sand Filters

5 Bag Koi Sand Filters

Vortex Chambers

Vortex Chamber Brushes

Disc Filters

012 940 4845/6



072 489 3087

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