Hydrodynamic cavitation is a physical process in flowing water. When water is forced through a narrow passage, its pressure drops and tiny vapour bubbles form. When the pressure recovers, the bubbles collapse, releasing small, intense bursts of energy into the water.
The process in three steps
- Pressure drop: water speeds up through a constriction, and its local pressure falls below the vapour pressure.
- Bubble formation: microscopic vapour bubbles form in the low-pressure zone.
- Collapse: as the pressure recovers, the bubbles implode, creating local shock waves, shear forces and short-lived reactive molecules.
What it does in pool and spa water
Repeated every time the water circulates, these micro-events break down organic contaminants, help the sanitiser work more effectively and change how minerals such as calcium crystallise – into smaller, rounded particles that stick less to surfaces and are caught by the filter.
In independent laboratory testing, EVVO Clear reduced the chlorine needed by 41%, chloramines by 36% and evaporation by 23% under controlled conditions.
What it does not do
Hydrodynamic cavitation is a physical enhancement. It does not replace the sanitiser and it does not remove calcium from the water. Water balance – pH, alkalinity and hardness – still needs to be managed.
Frequently asked questions
Is hydrodynamic cavitation the same as ultrasonic cavitation?
No. Ultrasonic cavitation uses sound waves and needs electricity. Hydrodynamic cavitation uses the shape of the flow path and the existing pump flow.
Does a cavitation unit need electricity?
A passive hydrodynamic unit such as EVVO Clear does not. It is driven entirely by the water flow from the existing pump.
Does cavitation replace chlorine?
No. It works alongside the sanitiser and helps it work more effectively.
Talk to EVVO
Dealer, distributor, service company or OEM? Find out how EVVO Sense and EVVO Clear can work in your market.
Become an EVVO partner