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If you’re drinking the water, you can store it indefinitely as long as you properly treat it and your container doesn’t break down. Without any treatment system, you should only leave rainwater in a rain barrel for up to four weeks. If you’re using the water on your garden or lawn, you can store your water until algae start to grow. 

Installation costs range from $1,500 to $10,000, depending on pond size, materials, and additional features like waterfalls or fish habitats.

How many fish can call your pond home depends on the volume of the pond and the fish size. Your pond's filtration system also influences the number of fish that will thrive in a pond. A general rule of thumb is to have 1 inch of fish for every square foot in a pond that's 2 feet deep. Another rule of thumb you can follow is to have one koi fish for every 200 gallons of water or two goldfish for every 200 gallons.

Seeps and springs form when groundwater reaches the earth’s surface. The main differences between them are the amount of water and the flow rate. Seeps are smaller than springs and consist of water that’s stagnant or flows slowly. Springs contain more water and flow more quickly.