Tums seriously, 630,000 gallons means that if i use that well half a day in whole year, i won't need to worry anymore.
Here , we have city water with chemicals as well but as long as you don't add a huge percent of water to your pond in one day, it is not gonna hurt any fish. For aquariums we use city water. The water needs to rest 1 day , if you will change some big amount of the water. But i think you don't have any more chemicals than we do. So you should have the same situation. If i can use city water, even if my well runs out of water, i can use city water and that will cost me about 2000 dollars to recover whole year's need. 1,000 gallon price is 7 dollars here.
