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Here’s the correct order for adding pool chemicals:

Total Alkalinity
pH
Calcium Hardness
Sanitizer (chlorine)
Cyanuric Acid (CYA)
And here’s why it’s a good idea to add pool chemicals in the above order:

Total Alkalinity helps stabilize, and prevent fluctuations in pH. Adjusting TA first, makes adjusting pH easier later
Calcium Hardness affects the physical “softness” of your water. And it’s much easier to adjust when you first balance your pool
A pH between 7.2 7.5 keeps your water feeling great, and your chlorine working effectively. But higher pH level reduce chlorine effectiveness half or more.
CYA works as a direct stabilizer for chlorine, protecting it from sun damage and helping it last longer. Test your water before adding CYA to avoid chlorine lock, since most chlorine products already contain CYA

While you balance your water, you may think to yourself:

“Can you mix pool chemicals?”

And the answer to that question is: Never. Never mix pool chemicals.

It may sound like it’ll save time, but it’s dangerous, risky business. Certain chemical reactions can produce toxic fumes, and even cause small scale explosions. And that’s not something any pool owner should ever deal with.

So for your health & safety, and everyone else’s, never mix pool chemicals.

Always add pool chemicals one at a time. As explained earlier, this method is faster, and a lot more effective when done in the right order.

(Ready to start adding chemicals to your pool right now? Read this: Balance Your Pool Water In 7 Easy Steps)