The TDS / refill math: why every 3–4 months isn't arbitrary, and how bather load changes it.
This guide is part of our Spa & Hot Tub Carepillar and is currently being written. Want to be notified when it's published? Drop us a line and we'll send it the day it goes live.
In the meantime, here's the pillar overview that covers the fundamentals:
Why bromine dominates spas, the odor trade-off, and when chlorine still makes sense.
Weekly rinse, monthly chemical soak, and the 12-month replacement rule most owners ignore.
The circulation loop vs. the therapy-jet loop, how venturi jets produce air-water mix, and the air-lock trick every tech should know.
How spa heaters differ from pool heaters, the 104°F safety limit, interlocks, and why recovery times matter.
Our CPO-certified techs run this exact playbook on every weekly service visit. Get a free quote.