Closing a 2-person saltwater hot tub for winter takes more than just draining the water. Here is the exact non-chlorine shock dose you need, why saltwater systems need it, and how to apply it correctly before you button everything up for the season.
Hot tub shock isn’t one product — it’s two different tools that solve different problems. Non-chlorine shock (MPS) oxidizes waste and clears cloudiness fast, while chlorine shock kills bacteria and resets contaminated water. Knowing which to reach for, and when, is what separates a tub that stays clear from one that constantly fights you.
Hot tub shock comes in two types: non-chlorine (MPS) and chlorine-based. Each does a different job. Knowing which one to reach for – and when – saves you cloudy water, skin irritation, and wasted product. This post breaks down both types clearly.
Hot tub owners often grab whichever shock is on the shelf without knowing there’s a real difference. Non-chlorine shock oxidizes contaminants and lets you soak sooner. Chlorine shock kills bacteria and is the right call when your water is genuinely compromised. Knowing which to use – and when – saves you a lot of frustration.
Not all hot tub shock is the same, and grabbing the wrong one can make your water worse. This guide breaks down exactly when to use non-chlorine shock versus chlorine shock, how much to add, and what each one actually does to your water.