How Often Should I Change the Water?

What is a shock?

Before you consider the long and tedious process of changing the water in your spa, you may instead want to give the hot tub a shock. What do we mean by a shock?

All of our hot tubs have tiny particles inside them that are usually invisible to the human eye. We are not necessarily referring to horrible dirty bacteria, sometimes they are just minerals or chemicals in the water. People in the industry often refer to these particles as Total Dissolved Solids (TDS).

Over the time, these particles combined with eachother and turn into bigger particles. Whilst they are still invisible individually, together they give the spa a very dull look. Water may often appear to be cloudy. It is at this stage that you may need to shock treat your water.

Shock treatments usually use a higher-than-normal dose of Chlorine to break up these large particles. Once broken down your water should again look fresh and clear.

So how do I know whether I should shock treat the spa or clean the water?

Eventually, the amount of particles in the water will become so great, that no amount of shock treating will make a difference. It is at this stage that you need to change your water.

We have a simple formula that should help you decide when its time to change the water:

Spa capacity (litres) ÷ daily bathers ÷ 12 = days between each drainage

So for example, if your spa has a capacity 2000L, and you have 3 people who use it each day, you should change your water approximately every 55 days.

We recommend giving your spa cover a good clean every time you change the water.