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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. 

Pond water should be changed approximately once a week. When you change it, change around 10% to15% of the water. It’s important to monitor the quality of your pond water as this will determine if it needs to be changed more often, or if you should be changing more or less than 15% of it when you do so.

The average pond maintenance cost is $2,000. But how much you pay to take care of your pond depends on multiple factors, such as the size of the pond and whether fish live in it. Your area's climate also affects the overall maintenance cost, as you may need to winterize your pond to protect it and any aquatic life in it during the colder months.

When deep cleaning your koi pond, transfer fish to a clean, uncontaminated container at least one foot deep, like a large bucket, tub, or kiddie pond. Fill the container with their existing pond water to avoid shocking them, and place the container in full or partial shade. When it’s time to reintroduce them into the pond, slowly add the new water to the container before adding the fish and container water back into the pond.