USA Koi is an online retailer focused on koi keeping and pond care, offering products for hobbyists who want to maintain healthy fish and clear, well-managed water. The company highlights premium pond medications, competitive prices, expert-approved supplies, and fast shipping on stocked items. Its extensive selection includes Aqua Meds treatments for pond health, water conditioning, dechlorination, beneficial bacteria, sludge and muck removal, algae control, and other pond-care needs.

Customers can also shop koi food promoted for supporting healthy, vibrant fish, as well as pumps, filtration systems, and filter media. Equipment includes UV lights and replacement parts, air pumps and aeration accessories, water test kits, pond heaters and deicers, and specialized Sea Side Aquatics filters, such as rotating drum, combi RDF, and Bakki shower systems. USA Koi also carries koi handling and viewing tubs, measuring tubs, holding tanks, nets, spawning brushes, and decorative koi items.

The site provides phone and email support and offers free shipping on purchases of $75 or more, alongside newsletter subscriptions and gift certificates