I began with an oversized half-horsepower chiller and roughly 1,000 GPH pump. Here is why a quarter-horsepower chiller and Active Aqua 800 became the better-matched PlungIT system.
How I Matched a Cold-Plunge Chiller and Pump to the Tub Read More »
In 2023, Michael Johnstone sourced and engineered an affordable PlungIT cold-plunge system, tested the hardware, sold units, and learned where the economics and health claims became complicated.
I Tried to Build a More Affordable Cold Plunge—Here’s What Happened Read More »
My surviving 2023 cold-plunge diary records eleven weeks of times, temperatures, missed days, and serious early headaches. This is the honest historical log—not a protocol or medical claim.
What My 2023 Cold-Plunge Diary Actually Recorded Read More »
On August 15, 2026, the final complete PlungIT system sold locally in San Antonio for $400. This is how a three-year product experiment reached its honest ending.
The Final PlungIT Sale: Closing a Project Three Years Later Read More »
A longitudinal observation found that AI-generated images helped establish identity, but personality-aligned voice became increasingly important to sustained interaction after visual identity stabilized.
Finding #3: Voice Interaction Became More Important Than AI-Generated Images Read More »
