carbonic acid bathing reduces venous volume buildup compared to plain water at the same temperature
Serial CO₂ full baths produced a measurable reduction in venous volume increase (measured by venous occlusion plethysmography) compared to fresh-water full baths at the same intermediate temperature, demonstrating a specific CO₂ effect on venous function.
What this means for you
When veins hold less pooled blood, circulation moves more efficiently — which most people feel as lighter legs, less puffiness, and better overall vascular tone. This kind of venous response is what supports the feeling of improved circulation that goes beyond what warm water alone can do.
The published research
CO2 Balneotherapy for Arterial Occlusion Diseases*:
· 1985
This page describes a documented finding about the underlying wellness technology. It is not a marketing claim about any specific device. For information about HOCATT specifically, visit hocatt.com.