10/23/2026
❓ FAQ Friday: What Closing Chemistry Protocol Should I Follow for my Pool?
Proper winterization starts with properly balanced water. Before adding closing chemicals, test your pool first so you know exactly what needs adjusting.
Before closing:
🧪 Test all water parameters
💧 Adjust pH to 7.2–7.4
⚖️ Adjust total alkalinity to 80–120 ppm
🪨 Adjust calcium hardness to 200–400 ppm
⚡ Shock the pool
🌿 Add algaecide
✔️ Allow chlorine to return to the lower end of its normal range
One important tip: don't simply add a generic closing kit without testing your water first.
Pool chemistry isn't one-size-fits-all. Testing before treating helps you avoid unnecessary chemical additions and gives your pool a better starting point for the months ahead.
A successful spring opening starts with how you put your pool to bed in the fall.
🌐 https://www.gbiservices.ca/services/pool-closing/
📞 613-797-7665