Closing a 6-person hard-shell hot tub for winter takes more than just draining the water. You need the right shock dose at the right time to kill what’s living in your plumbing before it sits dormant for months. This guide gives you exact amounts for both chlorine and non-chlorine shock, plus the steps to do it right.
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.
A hot tub party is one of the fastest ways to destroy your water chemistry. Six people in 400 gallons introduces a flood of contaminants that your sanitizer can’t handle alone. This guide walks you through exactly what to do before, during, and after a big soak to keep the water safe and clear.
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.