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My filter has multiple size connections. How do I know which size I should use? | Decorative Ponds & Water Gardens Q & A

Q: My filter has multiple size connections. How do I know which size I should use?

Q: My filter has multiple size connections. How do I know which size I should use?

Linda – Toms River, NJ

A: Manufacturers may offer several size connections for a filter or pump. Just take a look at the AllClear™ PLUS Filter & SolidFlo™ Pump Combo or the PowerUV™ & SolidFlo™ Pump Combo tech specs, and you’ll see what we mean.

Deciphering those measurement ranges – a ½ inch fitting to a 1-1/2 inch fitting and everything in between – can be a challenge for DIYers. When figuring out what size to use, keep two things in mind: flow rate and pond aesthetics.

Go with the Flow Rate

Your filter’s flow rate refers to how much water passes through it in one hour’s time. The more water your pond holds, the higher the flow rate will need to be. Generally, you want the flow rate of your system to be fast enough to turn over your pond at least once every two hours.

The flow rate will also determine how your pond looks, meaning how much water channels through the filter and down your waterfall. Whether you have a small pond with a slow meandering stream or a goliath water feature with a gushing 4-foot waterfall, the look of it will be affected by the filter’s flow rate. You’ll also need to factor in your head pressure when determining the amount of flow needed.

Choosing Tubing

The diameter of your tubing will determine the maximum flow it can handle. The greater the diameter, the more water can be moved (as long as your pump can handle it). Think of it like this: If you’re drinking water through a straw, you’ll get a bigger gulp from a standard-size straw than a narrow cocktail straw.

If you’ve determined that you need a pump that will move 2,500 gallons of water per hour, for example, following the recommendations below you would need to use 1-1/4″ tubing.

  • Up to 500 gph: Use 1/2-inch tubing
  • Up to 900 gph: Use 3/4-inch tubing
  • Up to 1,500 gph: Use 1-inch tubing
  • Up to 2,700 gph: Use 1-1/4-inch tubing
  • Up to 3,600 gph: Use 1-1/2-inch tubing

Tubing too small would restrict the flow of water, while tubing too large would not create enough pressure to achieve the desired look. Choose wisely!

Pond Talk: Have you experimented with your tubing sizes? What results have you seen?

Perfect for New or Existing Ponds - The Pond Guy® AllClear™ PLUS & SolidFlo™ Combo Kits

How Do I Know What Tubing Size to Use? – Water Garden Q & A

Flex PVC Tubing

Q: How do I know what tubing size to use? I want to increase the water to my waterfall from 1,500 gph (gallon per hour) to almost 4,000 gph. I currently have 1″ tubing will this work? – Matt of Vermont

A: No. Your pump and tubing are currently sized correctly, but if you increase the water flow to 4,000 gph you will need to increase the tubing to see the benefits of your new pump. I would guess that you would not see more than 2,000 gph if you leave the 1″ tubing. When using a 4,000 gph pump, the proper tubing size to use would be 2″. A good way to think about tubing size is to imagine drinking from a straw. If you were to try to drink a glass of water with a cocktail straw it would take much longer than if you were to drink that same glass of water from a standard size straw. Over the years we have developed a chart to help our customer’s size their tubing. Please see below. To see our selection of plumbing and accessories, click here.

Up to 500 GPH: Use 1/2″ Tubing
Up to 900 GPH: Use 3/4″ Tubing
Up to 1,500 GPH: Use 1″ Tubing
Up to 2,700 GPH: Use 1-1/4″ Tubing

Up to 3,600 GPH: Use 1-1/2″ Tubing
Up to 5,400 GPH: Use 2″ Tubing
Up to 13,500 GPH: Use 3″ Tubing
Up to 21,000 GPH: Use 4″ Tubing
Up to 42,000 GPH: Use 6″ Tubing

Plumbing Tip: Try to avoid 90 degree turns for this will cause friction slowing down and reducing your water flow. We always recommend flexible PVC to avoid connections that can not only leak but cause friction loss reducing your water flow.

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