Pond Filtration.  Why?
Most all of us want to have fish in our ponds but don't think about what happens to waste materials that plants and fish leave behind.
When these waste materials decompose, gases build up in the pond causing loss of fish, poor overall water quality, algae growth, and nasty looking water in general.  The best way to avoid this is to install a Biological Filter.  In this system, beneficial bacteria is placed into the filter (roughly every 30 days). This bacteria converts waste materials into nitrates that are used as food for your plants. Now, you have used the harmful waste material to create plant food, your plants thrive,water quality improves, and water clarity is maintained.

These Biological/Mechanical filters eliminate the majority of your pond maintenance and can easily be hidden under lily leaves or floating plants.
Skimmer / Biological waterfall systems are the perfect choice for those who want all the enjoyment of a water garden but 80 % less work year round.
Skimmers provide excellent mechanical filtration much like those incorporated in finer swimming pool systems.  They collect debris off of the surface of the pond preventing any netting or debris removal by hand.  As an added bonus, you can keep a skimmer system running year round while keeping your pumps, elec. wiring, waterfall hoses, ect out of the pond for a totally natural look.
Biological Filters provide the conversion of harmful products (such as fish & plant waste) into a plant fertilizer that helps grow all of your aquatic life and in turn leave you a much cleaner, clearer pond.
The center section stores beneficial bacteria. The Zeolite rock absorbs ammonia from fish waste, and the 1" top pad (where pond debris collects) is all we ever have to clean.  Cleaning the inner section would set us back to 'square one' as the beneficial bacteria would be lost and it might take a week or two to get established once it was re-applied. 
Filtration is one of (if not 'the') most important thing to keeping a pond alive and well.
Think about it.....
when your fish leave waste, where does it go?

It becomes part of the water itself which fish use to live and breathe.

Just like the waste of any living thing, it has to be removed (or in the case of pond filtration...converted) so it doesn't poison the fish.

Below you will see a brief example of pond filters.

Stop in to let us show you the many types and functions of pond filtration.
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BDR Ponds Exclusive Bio / Mech Filter System