Hot Tub Materials Compared
An honest comparison of the four hot tub shell materials, including the tradeoffs we would want stated if we were the ones buying, and where an aluminum tub is not the right choice.
Clean, safe, long-lasting tub water comes from preventing problems before they start, not from correcting them after. Balanced water chemistry reduces the amount of sanitizer needed. A simple preventative routine, guided by regular test strip readings, keeps water comfortable for bathers and easier on the materials. The result is water you change quarterly rather than weekly, using far less chemical input at every stage.
This guide covers the parameters, the treatment sequence, the products, how to care for the materials, and how to use and conserve water responsibly.
The first year with a cedar hot tub involves a genuine learning curve. The tub itself will go through a break-in period as the wood swells, settles, and releases tannins. The water care routine takes a few cycles to become instinctive. And the seasonal transitions, particularly heading into the first winter, require attention that first-time owners often do not anticipate.
This guide walks through what to expect month by month, what is normal, what requires action, and where the experience differs between a traditional all-wood cedar tub and one built with a marine-grade aluminium interior.
Hot tub water has four key parameters: alkalinity, pH, calcium hardness, and sanitizer. Each affects the others, so the order you balance them in matters. Test regularly, adjust gradually, and the water largely looks after itself. The goal is not to add more chemicals when things go wrong. It is to keep conditions stable enough that nothing goes wrong in the first place.
This guide covers what each parameter does, what range to target, how to test, and how to build a routine that keeps water safe without overcomplicating it.