Multi-Vent Underliner Roll - 125' each Roll

Multi-Vent Underliner Roll - 125' each Roll | Pond Liners

Multi-Vent Underliner Roll - 125' each Roll

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Starts at: $355.59

Brand: EasyPro

SKU: MV6125

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The Multi-Vent Underliner System is a patented, innovative and cost effective system designed to protect pond and lagoon liners from damage caused by methane gas and water accumulation.

It can also serve as a leak detection system for the liner. Providing gas venting, drainage and leak detection in one system is effective and cost-efficient.

The documented strength, capacity and longevity of this system make it a logical choice for pond liner protection.

 

Customer Question:

My pond liner lifts every time the water table rises. Is there a valve that would allow the water in but not out of the pond?

Easy Pro Answer:

With a liner that is already installed it is not an easy fix unfortunately. If you can drain the pond and get under the liner we have our LAV - Liner Air Vents. Basically a bulkhead fitting with a pressure valve is inserted into the liner at the lowest point. When the pressure builds up under the liner this valve is popped open and the air or water is released into the pond. After the pressure is relieved the valve closes again.

The other option is to install the Multi-Vent under the liner. The liner would have to be removed to do that. The pressure of the water in the pond forces any build up of air or water up the Multi-vent and out from under the liner. Unfortunately, this is only sold in 125' long rolls and has a minimum quantity of two rolls. It also ships factory direct via motor freight. A little much for a small water garden!

Please note the manufacturer of the Multi-Vent recently changed the roll length to 125', not the 150' listed in the catalog. That change was made after the catalog was printed.

 The Problem:

Nearly every pond builder has likely encountered a pond where the liner floated up off the bottom due to excess water or air buildup under the liner. Areas where the soil is high in organic matter tend to give off excess methane gas while other areas have a high water table, especially after large rain events. Both of these can cause the liner to float part way to the surface, all the way to the surface or in extreme cases the liner will float above the surface creating what are commonly called "whale backs" Previously the only way to vent this water or air from under the liner was by cutting the liner and installing a vent.

The Solution:
EasyPro is pleased to introduce another industry first...the patented Multi-Vent Underliner System! This easy to install system is effective, low cost and best of all does not require cutting the liner. Multi-Vent is a series of perforated tubes that install under the liner. The tubes are wrapped in a non-woven geotextile to prevent plugging. By simply laying a strip of Multi-Vent on the ground before installing the liner you can prevent costly future problems. It takes a great deal of pressure for the water or air to lift the liner. With Multi-Vent, neither water nor air can build up pressure under the liner. Instead it will vent through tubes to the outside of the pond, eliminating any chance of the liner floating. Because of its low cost, Multi-Vent is cheap insurance under any liner job!

  • Multi-Vent lines are rolled out over the prepared surface and are covered by the pond liner.
  • This method avoids the need for trenching and it locates the Multi-Vent right where methane and other gases are most likely to accumulate.
  • Most often each end of the Multi-Vent is simply extended out beyond the liner allowing the air or water to drain out.
  • You can also use Multi-Vent to capture ground water in a sump or monitoring pit.
  • Multi-Vent can be connected to 3" pvc pipe which would carry the water to the sump.
  • A submersible pump with automatic on/off floats can be used to remove excess water.

 

This method avoids the need for trenching and it locates the Multi-Vent right where methane and other gases are most likely to accumulate.
Most often each end of the Multi-Vent is simply extended out beyond the liner allowing the air or water to drain out.
You can also use Multi-Vent to capture ground water in a sump or monitoring pit.

Multi-Vent can be connected to 3" pvc pipe which would carry the water to the sump.

A submersible pump with automatic on/off floats can be used to remove excess water.
You can also use Multi-Vent to capture ground water in a sump or monitoring pit.
Multi-Vent can be connected to 3" pvc pipe which would carry the water to the sump.

A submersible pump with automatic on/off floats can be used to remove excess water.Multi-Vent can be connected to 3" pvc pipe which would carry the water to the sump.

A submersible pump with automatic on/off floats can be used to remove excess water.


A submersible pump with automatic on/off floats can be used to remove excess water.
Multi-Vent is easy to install. Typical installation uses one strip of Multi-Vent every 15'. 

For ponds 30' or less, one strip should be enough. 

In larger ponds multiple strips can be run under the liner, each venting beyond the liner perimeter or they can be hooked together in a manifold / grid system.

Multi-Vent is available in 125'  rolls and can easily be cut to length or joined together using fittings shown at left. 

End caps are used to open ends to prevent foreign objects from plugging the tubes. 

EasyPro provides design assistance to meet the needs of individual ponds and lagoons. Proper planning saves money, speeds installation and dramatically extends the life of a liner.

View the PDF for complete operating instructions.

View PDF Info Sheet

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