WOOD FIRED HOT TUBS

The four numbers that matter in an aluminum hot tub, why calcium hardness is the one most owners miss, what order to balance in, and which common spa products are not compatible.

Aluminum doesn't rust the way steel does, but it is a metal and it reacts under specific conditions. What those conditions are, why soft water is the one most owners don't expect, and how the tub is built to handle them.

Three different things get called pitting, and they have different causes. What the deposits actually are, why soft water is the one most owners don't expect, and how a tub already showing them gets put right.