A good rule of thumb is to change 5% to 15% of your koi pon’s water every week. Partial water changes help keep your koi healthy, and replacing small amounts at a time prevents causing stress for the fish.

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.

Most outdoor water fountains and features do not use a lot of electricity, typically consuming between 100 and 250 watts per day. The size of the fountain's motor can impact its overall electricity usage. To reduce energy consumption, you can use a timer to automatically turn the fountain off at night or when you are away from home. Additionally, installing solar power components can help lower electricity costs after the initial investment is recouped.

Fountain maintenance is an important part of having a clean foundation in the first place. To keep your fountain water clean, you can use a water additive designed specifically to limit scale, algae, and other buildup in fountains. Or opt to use white vinegar as a pantry-ready water additive.