How to Use Chlorine Granules Safely in Your Spa

Spa Fuel
May 15
2 min read

Chlorine granules are one of the most effective ways to keep your spa water clean, clear, and safe. But if you’re new to spa ownership—or just want to be sure you’re using them the right way—this guide is for you.

At Spa Fuel, we believe spa care should be simple, not stressful. So here’s everything you need to know to safely use chlorine granules and enjoy a worry-free soak.

Why Chlorine Is Essential for Your Spa.

Chlorine is a powerful sanitiser that eliminates bacteria, viruses, algae, and other unwanted nasties in your hot tub water. Without it, spa water quickly becomes unsafe to use.

Our Spa Fuel Chlorine Granules are fast-dissolving and easy to dose—specially designed for hot tubs, including Lay‑Z‑Spa models and inflatable spas.

🔒 Safety First – Before You Add Anything

Wear gloves when handling chlorine
Keep granules dry and sealed in the original container
Never mix with other chemicals
Always add chlorine to water—never the other way around

👉 Pro Tip: Keep the spa cover open and the jets running when adding chemicals for better circulation and to let gases escape safely.

Step-by-Step: How to Use Chlorine Granules Safely

1. Test the Water First

Use your LaMotte or Spa Fuel–compatible test strips. Check the free chlorine level—it should be between 3–5 ppm for regular use.

2. Calculate the Correct Dose

Use our Spa Fuel dosing chart or quick formula. For example:

Dose Guide: Add 3g of chlorine granules per 1,000 litres of water to increase chlorine by 1 ppm.

So if your spa is 1,500L and your chlorine reads low (1 ppm), you’ll need around 12g to bring it to 5 ppm.

3. Dissolve or Sprinkle

You can dissolve granules in a clean jug of warm spa water, then pour around the edges of the spa
Or sprinkle directly into the water with the jets running (only if your product label allows)

Our Spa Fuel granules are designed to dissolve quickly—ideal for direct application.

4. Wait Before Using

Let the water circulate for at least 20 minutes, then re-test. If levels are correct (3–5 ppm), it’s safe to enjoy your spa.

How Often Should You Add Chlorine?

After each use – top up to maintain safe levels
Every 2–3 days – if not in use, test and adjust
Weekly – perform a deep clean and water balance check

Common Mistakes to Avoid

Overdosing chlorine – can cause skin and eye irritation
Not testing first – you may add chlorine unnecessarily
Adding to cold water – always dose when the spa is warm (30–40°C)
Using pool chlorine – always choose chlorine designed for spas like Spa Fuel granules

Why Use Spa Fuel Chlorine Granules?

Fast-dissolving – works quickly, no residue
Easy dosing guide – with color-coded packaging (Pink = Chlorine)
Works with your test strips – for clear, confident adjustments
Designed for hot tubs – not harsh like some pool chemicals

Final Thoughts

Chlorine granules are your spa’s best friend—but only when used correctly. With a little knowledge (and the right tools), balancing your spa water becomes simple and safe.

With Spa Fuel, you get clear guidance, smart packaging, and a brand built to make water care easier—for you and the planet.