How to use Venturi instead of a blower on a concrete or block hot tub build - Video

How to use venturi on a hot tub build instead of a blower? In this video I will explain how a regular setup with pump and a blower works and how this can be changed for those of you that do not want to include an air blower in your setup.

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In a gunite hot tub, the Venturi effect isn't used in isolation to create air bubbles in the jets. The process usually works in conjunction with an air blower system, though the Venturi principle still plays a part in enhancing the air-water mixture. Here's how it unfolds:

1. Air Blower System:

At the heart of the system lies an air blower that pushes air through dedicated air lines.
These air lines have smaller holes strategically placed near where they connect to the jets.
2. Venturi's Magic:

As the main water flow from the pump passes through the jet nozzles, it encounters the narrow section created by the Venturi tube (hourglass-shaped constriction).
This constriction accelerates the water flow, causing a drop in pressure within the Venturi tube.
Remember, low pressure sucks! Due to this pressure difference, air from the nearby holes in the air line gets sucked into the high-velocity water stream.
3. Bubbling Up:

This air-water mixture then exits the jet nozzle at high pressure, creating a turbulent and air-infused flow.
As the pressure releases, tiny air bubbles form within the turbulent water, giving you that bubbly and aerated jet experience.
Venturi's Role:

While the blower provides the initial air, the Venturi effect amplifies the air entrainment, drawing in more air than the blower alone could manage. This synergy between the blower and Venturi effect results in stronger, bubblier, and more powerful jets in your gunite hot tub.

Additional Points:

Some gunite hot tubs might have separate Venturi injectors instead of using the jet nozzles themselves. These injectors function similarly, pulling air into the water flow using the Venturi principle.
The intensity of the bubbles can be adjusted by controlling the air intake through dedicated valves on the air line or jet itself.
So, while the air blower is the workhorse pushing air into the system, the Venturi effect acts as a clever booster, enhancing the air-water mixing and leading to those satisfyingly bubbly jets in your gunite hot tub.