The extremely popular 10" Filtering Waterfall Weir creates a breathtaking 10" curtain of falling water, while offering supplemental bio-mechanical filtration that supports the growth of beneficial bacteria. Manufactured with a super-strong injection molded housing unit, this exceptional waterfall weir creates a professional waterfall effortlessly, and is easy to retrofit to existing ponds. This product is rated for pump flows up to 1200 gallons per hour.
10" Filtering Waterfall Spillway for ponds up to 1,000 gallons

The extremely popular 10" Filtering Waterfall Weir creates a breathtaking 10" curtain of falling water, while offering supplemental bio-mechanical filtration that supports the growth of beneficial bacteria. Manufactured with a super-strong injection molded housing unit, this exceptional waterfall weir creates a professional waterfall effortlessly, and is easy to retrofit to existing ponds. This product is rated for pump flows up to 1200 gallons per hour.

10" Filtering Waterfall Spillway for ponds up to 1,000 gallons

       
  • Create a Stunning Pond Waterfall Display: Showcase your water feature with the relaxing sights and soothing sounds of a waterfall spillway. A beautiful addition to any small indoor aquarium, landscape fountain, or backyard water garden.
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  • Maximized Filtration: This 10" wide waterfall features BioBalls, a biological filter pad, and a built-in rock and plant shelf. It provides biological and mechanical filtration while aerating your pond—delivering a dramatic, cascading 10" waterfall for both function and beauty.
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  • Enhanced Filtration with Oxygen Boost: Scientifically engineered with a built-in Venturi piping system to increase oxygen levels in your water feature. Includes a bag of BioBalls for superior biological filtration—ideal for supporting healthy ponds and aquatic life.
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  • Handles High Water Flow with Ease: This filtering waterfall weir is designed to accommodate up to 1,200 GPH, making it a powerful addition to any pond waterfall spillway or waterfall filter setup.
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  • This pond waterfall box provides a complete solution for building beautiful, flowing pond waterfalls. Backed by a 5-year warranty, it’s a dependable choice for anyone seeking a reliable waterfall pond spillway for their outdoor pond.

FAQs & Calculations to Help Select the Correct Kit

1. How Many Gallons of Water does My Water Feature Hold?

Rectangular Ponds

Length x Width x Average Depth x 7.48 = Gallons

Example: A rectangular pond 15’ long, 10’ wide and 1.5’ Deep Pond is...

15’ x 10’ x 1.5’ x 7.48 = 1683 Gallons

Oval Ponds

Length x Width x Average Depth x 0.8 x 7.48 = Gallons

Example: An oval pond 15’ long, 10’ wide and 1.5’ deep is...

15’ x 10’ x 1.5’ x 7.48 = 1683 Gallons

Round Ponds

Length x Width x Average Depth x 7.48 =Gallons

Example: 15’ long, 10’ wide and 1.5’ Deep Pond

15’ x 10’ x 1.5’ x 7.48 = 1683 Gallons
 

Streams

Length x Width x Average Depth x 0.25 x 7.48 = GALLONS =Gallons

Example: 15’ long, 10’ wide and 1.5’ Deep Pond

15’ x 10’ x 1.5’ x 7.48 = 1683 Gallons
 
2. How Big of a Pump Do I Need??
Minimum pump size is determined by pond type, water volume, head height and friction loss. The minimum pump size recommendations are:

Water Garden, Few Small Goldfish

Circulate total pond water valoume every 2 hours.

Example: 2,000 GPH pump for a 3000-gallon pond with 2’ waterfall.

Fish Pond, Several Small Fish

Circulate total pond water valoume every 1 hour.

Example: 3,800 GPH pump for a 3000-gallon pond with 2’ waterfall.
 

Koi Pond, Several Large Fish

Circulate total pond water valoume every 3/4 hours.

Example: 2,000 GPH pump for a 3000-gallon pond with 2’ waterfall.

Calculating Head Height

Dynamic head pressure is found by taking the vertical height of your waterfall; the distance between where your pump is (typically in the skimmer) and where your waterfall is, and adding the static head pressure (pipe and fittings) 1’ for every 10’ of tubing and 1’ for every elbow or “T” fitting.

Example: 3' (vertical height) + 2.5 (25' of tubing) + 2' (for 2 elbows) = 7.5' of Dynamic Head Pressure

Note:It is important to take into consideration while calculating how much flow will be at the top of your waterfall by accounting for the head height due to the laws of fluid dynamics. Please refer to the flow chart above to help choose the correct pump.
 
3. What Size Tubing Do I Need?
Tubing Size Efficiency GPH Minimum GPH Maximum GPH

0.5”
< 300
60
420

0.75”
< 720
300
900

1”
< 1,200
700
1,500

1.25”
< 1,600
900
3,200

1.5”
< 2,600
2,000
4,400

2”
< 4,800
3,000
6,800

3”
< 9,000
6,000
14,000

4”
< 21,000
14,000
28,000

6”
< 42,000
33,000
60,000

About Half Off Ponds

Customer service is our business. We have been satisfying fish pond, water garden, and backyard waterfall enthusiasts for over 25 years! We're glad to assist you with your pond building project - from start, to finish!

Thanks for your business! We appreciate it!

- The Half Off Ponds Team