Clear water doesn't always mean healthy water. A pond of green algae water may be very healthy in all other respects of ammonia, ph, nitrites and nitrates.
Clean looking clear water could have high ammonia and nitrites that are very harmful to the fish, but still look clean and clear! Good filtration is the first step to take towards that clear clean healthy water. Thadius has a good description of a simple effective filtration set up. There are other ways to do it also. LOTS of DIY information out there on the web.
DIY filtration is not hard and if care is taken will not cause disasters of draining the pond (don't ever put the pump on the bottom of the pond) Out of pond pump and filter set ups are the way to go if building a new pond.
Clean looking clear water could have high ammonia and nitrites that are very harmful to the fish, but still look clean and clear! Good filtration is the first step to take towards that clear clean healthy water. Thadius has a good description of a simple effective filtration set up. There are other ways to do it also. LOTS of DIY information out there on the web.
DIY filtration is not hard and if care is taken will not cause disasters of draining the pond (don't ever put the pump on the bottom of the pond) Out of pond pump and filter set ups are the way to go if building a new pond.