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  • The Benefits of a Pond Skimmer (Post)

    Having a pond skimmer can be extremely beneficial because you will be able to avoid some pond problems in the future. A pond skimmer is made to remove debris on the surface of the pond before it si ...

  • ​Intake Bay - an Alternative Skimmer for Large Pond Systems (Post)

    About Intake Bays:The primary job of a pond intake bay is to remove floating debris off the surface of a large pond before it has a chance to sink to the pond floor. Removing the unsightly debris bef ...

  • Year Long Aeration for Your Pond (Post)

    It is imperative that you run your air pump 24 hours a day 7 days a week to build up the oxygen level to the maximum your pond can hold and then maintain it at maximum level. Pond water on ...

  • Do-It-Yourself Pond Kit During Quarantine (Post)

    During the COVID-19 pandemic, homeowners are trying to stay busy and active while practicing social distancing. We understand it can be difficult to manage everything from work to house chores. Yo ...

  • Spring Pond Maintenance (Post)

    Learn how to get your pond ready for spring with the few tips and best practices for pond maintenance from the experts at Underwater Warehouse. This article provides a list of all the pond suppl ...

  • Pond Prep for Autumn & Winter Seasons (Post)

    Tropical water lilies and other plants have reached their maximum potential. Temperatures have cooled a little, so you can enjoy being outside without sweating. Water clarity is usually at its b ...

  • Pump or No Pump for the Winter? (Post)

    Option #1: Keep Your Pond Running A pond can be a beautiful addition to your winter landscape. The waterfalls create beautiful ice sculptures, as well as create a natural water hole for wildlife ...

  • Your Essential Fall Home Maintenance Checklist: Get Ready for Cold Weather (Post)

    Falling leaves, cooling temperatures, and tons of yard work all means that Autumn is on its way. With all that going on, you’re going to want to do everything you can to keep your pond clean an ...

  • How To Systematically Find a Pond Leak (Post)

    Finding a leak in a pond can be really frustrating. You just know that the water is disappearing faster than it should be,but you do not see a wet spot anywhere along the sides. You wonder if thi ...

  • Best Tips for Fall and Winter Pond Maintenance (Post)

    Have you ever noticed that your pond water is clearer in the fall? This is typically due to cooler temperatures and full, lush plants. To keep your pond looking its best throughout the fall seaso ...

  • Dealing with Green Water: Proven Steps to Achieve Pond Clarity (Post)

    Seeing your beautiful koi or water lilies through a layer of murky, pea-soup green water is one of the most common and frustrating challenges for any pond owner. This green tint is caused by a rapid ...

  • Filter Media Explained: Bio-Balls, Lava Rock, and Filter Pads (Post)

    Filter Media Explained: Bio-Balls, Lava Rock, and Filter Pads  Choosing the right media is essential for pristine water clarity and the thriving health of your fish and plants. At Underwater War ...

  • Pond Winter Preparation (Post)

    It is hard to believe it is that time of year again. Understanding how to transition the pond through the seasons is very important to understand. With the right techniques and products the tran ...

  • Bottom Drain Installation Guide (Page)

    Bottom Drain Under Liner to Skimmer The bottom drain is installed under the liner. Flex PVC pipe carries the water under the liner to the skimmer box. A bulkhead fitting is installed in the skimm ...

  • How to Install a Pond UV Clarifier (Page)

    Small Ponds (up to 1,000 Gallons) using a Dedicated Submersible Pump For small ponds, or for applications where the UV is operated independently from other filters, this installation configuration ...

Koi Pond Supplies & Water Garden Equipment

Underwater Warehouse is your ultimate destination for koi pond supplies and equipment. We offer everything you need to create, maintain, and enhance stunning water features and backyard water gardens. Whether you're a seasoned pond enthusiast or just starting, our wide selection of koi pond filters, pumps, liners, water treatments, and more ensures your water feature stays beautiful. Get all your pond essentials shipped conveniently throughout the United States.

Pond Supplies, Kits, & Lighting

Discover everything you need for your koi pond or water garden at Underwater Warehouse. Our collection features essential pond supplies, including convenient pond kits for new setups or upgrades. Illuminate your water features with our variety of pond lighting options, transforming your backyard into a stunning focal point.

Water Garden Supplies

Create a peaceful water garden oasis in your backyard with Underwater Warehouse. We offer a full array of water garden supplies, including external and submersible pumps, and essential water treatments. Our products help maintain a healthy, thriving natural ecosystem, ensuring your water feature stays beautiful all year long.

Water Features and Fountains

Elevate your backyard with our stunning selection of water features and fountains. Whether you're seeking a small, decorative fountain or a grander water feature to complement your koi pond or lake, we offer a wide variety of styles and sizes. Our beautiful and functional pieces help you create a serene and inviting outdoor oasis.