Koi pond with lily pads and fish that has been spring cleaned

Spring Clean Your Koi Pond in 6 Steps

Corralling dust bunnies and taming out-of-control closets aren’t the only deep cleaning tasks for spring. The outside of your home needs some freshening up as well. Aside from removing old debris your garden beds and aerating your lawn, take time to spring clean your Koi pond. Here are six steps to follow.

Step 1: Remove netting cover from winter.

In March or early April, remove the netting used to cover your pond during the winter.

Step 2: Place your plants in the proper areas of your pond.

If you need help with plant placement, please refer to our water garden plants page for more details. Start fertilizing your plants with aquatic plant fertilizer. By now, you should see new green shoots growing in most pots. Don’t worry if you don’t see growth from every plant yet!

Step 3: Remove sediment with a fish net.

Remove sediment from the bottom of the pond (leaves, dirt, etc. that may have slipped through the netting) with a fish net. This should be a quick and easy step, provided that the pond was properly cleaned and netted in the fall.

Step 4: Replace pump.

If you removed your pond pump for the winter, place it back in the pond for spring and summer use.

Step 5: Refill with water and de-chlorinate.

If there has been evaporation over the winter, add water to the pond to fill it to the top. Add de-chlorinator to the water based upon the amount of new water added.

Step 6: Begin feeding Koi.

When the water temperature starts warming, your fish will become more active. You may begin feeding them floating fish food.

Why is my pond water green? I followed all your steps!

Please remember, even though your pond may be crystal clear upon opening, it is very typical in the spring for it to develop an algae bloom (green water). Do not panic! This is a very normal process that can happen every spring. Many additives, both natural and chemical, are available to help you achieve clear water without spending an abundance of time or effort to do so.

Use water plants effectively

In order to achieve a naturally balanced pond, it is necessary to have 2/3 of your pond surface covered with plants (such as lilies, hyacinths, and water lettuce) along with the correct amount of oxygenating plants on the bottom of your pond. When the aforementioned plants grow enough to do their jobs, your pond water will become clear.

If your pond water is not clearing up after 4-6 weeks, you probably will have to cover more of your surface water with plants or add more oxygenating plants to the bottom of your pond. This formula rarely fails if it is executed properly.

Your garden Koi pond is now ready for the summer season. Happy water gardening! All products and accessories discussed here are available at Aquatic & Garden Decor.

Download the PDF version of this tip sheet for easy printing.