The original pond was then expanded from a oval pond of about one thousand gallons to it present elongated 2500 gallons. This meant that the filtration system also had to be upgraded.
The original filter was good for about 750 gallons, and worked fairly well when backed up with an air pump and an auxiliary filter with a fountain head rated for about 250 gallons. We limped along with this set up while we planned a more extensive filtration system.
When winter arrived, we felt very protective of the 13 two inch goldfish so they spent the winter in an indoor aquarium. After summer came and went, the 13 goldfish were now six inches so again everybody wintered over inside. During spring clean-up, I drained the pond to get all of the leaves that fell in out and I discovered another five fish that were about an inch long. This was a good sign because the fish were going to be too big for the 70 gal aquarium next winter, and if the hatchling lived through the winter so would the older fish!