I have a flowing well in my backyard and wanted to utilize the water for a pond. The size of the pond will be about 15'x15'x3'. The well flows 51 degree water at a rate of about 3-5 gallons per minute. I am going to build stream from the well source that empties into the pond and another stream for exit so there will be constant fresh water for the pond. Hopefully eliminating a need for a filter. I wanted to house koi in the pond but am worried about water quality. Is the constant supply of fresh water good for the fish? The ponds water will be completely recycled at least once a day. We do have iron in our water but it's not high enough to require an iron filter for drinking. I am going to do a ph test to see what it is out of the well. Any suggestions?