Helpful Siphon Tips

Venturi Siphon Instructions and Troubleshooting

The Venturi siphon draws a concentrated solution from a bucket through a flexible suction tube and then dilutes it with the passing water stream at an approximate ratio of 20 parts water to 1 part concentrated solution.


The 10:1 dilution ratio is directly related to the amount of water pressure available through your garden hose. As water pressure increases, the dilution ratio will increase. 


CAUTION! Do not drink from a hose that has had foam, chemicals or any other solutions through them. Follow all manufacturer's recommendations. Detach the siphon from your faucet after use.

Mixing a Concentrated Solution

Determine how much foam solution you will need. Certain foams require an application of a specific amount of product over a specific area. Follow the manufacturer's recommendations. Prepare a water/foam solution that is 10 times stronger than the rate normally used. For each gallon of water used in your solution, mix in 10 times the manufacturer's recommended rate of foam. For each gallon of concentrated solution you prepare, your siphon will apply 10 gallons of correctly diluted solution.


Determine the ratio of your siphon.

What you will need: A large container you know the Volume of (Example - 5 Gallon Bucket)


Step 1:

Set up the siphon on the Faucet. Connect the hose to it. 

Step 2:

Fill the small container with clear water (example - 1 Quart) and place the small siphon hose into it.

Step 3:

Hold the end of the hose in the large container (example - 5 Gallon Bucket)

Step 4:

Turn on the water and fill the large container until the small container is empty.

Step 5: 

Measure the amount in the large container (Example - 5 Gallons) 

Step 6: 

Calculate the ratio. 5 gallons (20 Quarts) to 1 Quart = 10: 1



If the siphon appears to be malfunctioning do a simple test to determine that no other external conditions are affecting this device.

-Attach the siphon to a faucet that is connected to a building.

-Attach a 5/8 inch round garden hose to the siphon. Do not put any devices on the end of the hose.

-Use a small container and fill it with water, put the siphon hose in it.

-Turn on the water.

-If the siphon action does not occur then the unit is defective. If it does work; then there is some external problem.

Common Issues


Why doesn't my siphon draw up the foam?

  1. The hose is longer than 50 feet so very little back pressure is created.
  2. The device on the end of the hose is not allowing the 6 gallons per minute flow to occur.
  3. The hose used is a coiled or flat type of hose. These types of hoses are all low-volume hoses that do not allow the 6 gallons per minute flow.


Why does water leak from the hole on the side of the siphon?

  1. The hose is longer than 50 feet. The back pressure is to low.
  2. Water pressure is too low… below the 35 psi minimum water pressure.


Why is there a square plastic piece inside of the siphon?

This plastic piece is part of an anti-siphon system required by the federal government. If for some reason the pressure is lost from the water source instead of the foam bleeding into the water system it will leak out of the hole on the side of the siphon.


Can I add a Y fitting to my faucet before adding the siphon?

No, most units will restrict the flow of water below the minimum of 6 gallons per minute.


Why does my pressure drop when using the siphon?

Because to create a suction strong enough to draw up the foam the water needs to be pushed through a very small hole which causes a reduction in water flow.