Making a home made customised filter

Question
Hi I have a 4' feet , width 15' , height 25' tank . I have a Pearl Arowana . The problem is my tank gets cloudy and dirty in 3 - 4 dayz so I have to frequently change the water . So please can u tell me how should i make a powerful filter at my home very easily by myself for my Arowana tank and if possible can you evn provide me with the proper picture of the parts that are needed when i will be making the filteration setup . I am sure you will be able to sort my problem  . Would be thankful if you help me out .Take care...
         Have a great day !!!

Thanks and regards

Anoop.

Answer
Anoop,
The filters that I make are sponge filters for my Betta tanks. I do not make the type of filter that you need. I would suggest getting a store bought filter for the size tank that you have. This way you will know that it is working properly. Remember, when you add a filter, the tank will cycle and there is a good chance you will lose any fish that is in it. Sorry I could not help you construct a filter.