About Us

William started his KOI business in 1980 as a KOI wholesaler to local pet shops. Over the next few years, he expanded to building KOI ponds with his own contractor license as well as breeding and spawning KOI. With his business knowledge and interest in KOI, his company grew in 2000.

W. Lim Corporation became a leading distributor of high-end parts and supplies for the KOI industry. We are going forward to aquaculture and aquaponics. We are always on a quest for superior efficiency, quality, and performance. William developed and engineered new, innovative items.

  • The Wave Super-Efficient Pumps, W. Lim’s registered trademark (Wave I, Wave II and Dragon Series) which utilizes custom Marathon motors and impellers
  • Bio & Mechanical Filter: The Performance Bead, The Legend, and The Bio Reactor
  • The Amalgam UV Sterilizer and Wave UV Sterilizer (Patent # 7767978)
  • Vortex Micro Strainer, Settlement Tank

W. Lim Corporation is committed to providing a professional, helpful “One-Stop-Shop” solution that will help reduce upfront costs as well as overall operating costs. Our ultimate goal is to help you or your customer to create crystal clear water in an energy-efficient manner. 

Our services include the architectural design or consultation of high-efficiency pumps of superior quality, minimum restriction filters, the strongest UV light in today’s market, and many other quality items. From 1,200 to 30,000 gallons and beyond, we can help!

We look forward to helping you, and your customer create a beautiful KOI pond or water feature you will enjoy for many years!


2503 Troy Ave

South El Monte, CA 91733


Open Hours

M-F: 7:00 am - 2:30 pm  

S & S: Closed


Phone Number




Patent #7767978 EPA Est. No 84519-CA001