You pulled the cover off, and the water looks green or cloudy. You want to jump in, not stare at a swamp. I get it. I’ve opened hundreds of pools, and the secret isn’t magic; it’s just using the right stuff in the right order.

Don’t guess. Go to the store and get these specific pool opening chemicals:

• Alkalinity Increaser (Baking Soda)
• pH Adjuster (Plus or Minus)
• Calcium Hardness Increaser
• Chlorine Shock (Liquid is best)
• Algaecide
• Stabilizer (Also called Conditioner)

Step 1: Balance the Water First

Many people make a big mistake here. They see green water and immediately dump bags of shock into the pool. Don’t do that.

If your water chemistry is wrong, the shock won’t work. You will just waste money. You have to balance the water first so the chlorine can do its job.

Use a test strip or a drop kit. Then, fix the numbers in this exact order:

1. Fix Alkalinity First

Alkalinity acts like a bodyguard for your pH. If Alkalinity is too low, your pH will go crazy. Get this number between 80 and 120 before you do anything else.

2. Fix the pH

Your pool water needs to be neutral. If it is too acidic, it hurts your eyes. If it is too basic, the chlorine stops working. Aim for a number around 7.4.

3. Check Calcium

This keeps your pool walls safe. If calcium is too low, the water effectively “eats” your liner or plaster. Keep this around 200.

Step 2: Shock the Pool

Now that the water is balanced, it is time to kill the algae and bacteria. This is called “shocking” the pool.

• Use Liquid Shock

I prefer using liquid chlorine to open a pool. It mixes instantly and doesn’t leave cloudy dust on the bottom. If you use powder shock, dissolve it in a bucket of water first so it doesn’t bleach your liner.

• Do It at Night

This is a pro tip. The sun burns off chlorine very fast. If you pour shock in at noon, the sun eats it before it kills the algae. Pour it in after sunset. Let the pump run all night to circulate it.

Step 3: Protect Your Work

Once the water clears up and the chlorine level drops back down to normal (around 3 ppm), add the finishing touches.

• Add Algaecide

Think of algaecide as a backup plan. It kills the tiny algae spores that the shock might have missed. It stops the water from turning green again next week.

• Add Stabilizer

Stabilizer is like sunscreen for your chlorine. Without it, the sun destroys your chlorine in a few hours. Check your levels. If you need it, add it slowly.

Summary

That’s it. Balance the water, shock it at night, and protect it with algaecide. If you follow this list of pool opening chemicals, you will be swimming while your neighbors are still fighting with green water.