The reason that you need good Koi filters is that in a smaller pond the Koi will stir up all of the sedaments and particles in the pond which and because there isnt as much space as in the wild they need a good filter to clean the pond and keep them alive.
The reason that you Koi pond needs good Koi filters is that it will suck up the waste particles during those times when the Koi are active and creating a commotion.
There are a couple of good advantages to buying good Koi filters. One of them is that it will keep the Koi happy because they get a clean pond with nice clean water and the next is that it will make the Koi easier to see through clearer water.
You may already realise that there are more than one type of koi filters. Here are the two I have used in the past.
The first kind is the machine that is built into your pond. This type of filter will suck up all of the waste and particles so you will be able to clean it out later.
In my opinion this is the best kind, it is a little more expensive than the the next method but it does a good job.
The next Koi filters you can buy are a type of pond cleaner. This is an unharmful liquid that will break down all of the waste and bacteria in your pond. This works ok but is nowhere near as good as real machine Koi filters.
So when you go out and buy your Koi filters you need to get the right sized one. You can simply give the measurements to the person at the store and they should be able to give you the right sized Koi filters.
Or if you are buying online then most websites should give you some sort of measurement table.
The main thing to remember when buying Koi filters is that you get the right sized one and if you do you will end up with a happy healthy Koi pond.