Whether you plan to add fish to your pond or not, clean, clear water is most desirable. Achieving clarity in your water is not difficult... it's a
matter of consistency. Floating plants such as water lily, hyacinth or lettuce help minimize algae and create oxygen, which is necessary for fish.
Small aquatic snails are also helpful in keeping the pond clean. Among common
snails used in this environment would be the Apple or Melantho snails.
If you're planning to add fish, such as koi or goldfish to your pond you'll need
a filtration system along with a pump. This will help keep the water oxygenated
and your fish healthy. If you live in an area where temperatures drop in the
winter, you'll need to add a heater to keep the water from freezing. Keep in
mind that some fish cannot survive these colder temperatures. For more
information about pond fish,
Probably the most effective way of keeping your water clear is Pond Bacteria.
Adding bacteria adds bacterial colonies on the bottom of the pond and on the surface of anything you have placed in the pond, such as rocks and filters.