Spring Pool Opening Guide: Complete Checklist & Tips | ePoolSupply

Spring is here, and that means it's time to wake your pool up from its winter slumber. Whether you're a first-timer or a seasoned pool owner, this comprehensive guide walks you through every step of opening your pool the right way — so you can dive in with confidence all season long. With 25 years of pool supply expertise, the ePoolSupply team has put together the definitive checklist for a smooth, safe pool opening.

Step 1: Pre-Opening Inspection Checklist

Before you touch the water, do a thorough walk-around of your pool and equipment. Catching problems early saves time and money.

Remove and clean the pool cover: Pump off standing water, remove debris, and let the cover dry before folding and storing it.
Inspect the cover for damage: Check for tears or holes that may have let debris or animals in over winter.
Clear the pool deck: Remove any leaves, dirt, or debris from the surrounding area before they blow into the water.
Check pool walls and floor: Look for cracks, staining, or algae growth that developed over winter.
Inspect all fittings and returns: Make sure return jets, skimmer baskets, and drain covers are intact and properly seated.
Check for freeze damage: Look for cracked pipes, fittings, or equipment housings — especially if you had a hard winter.
Reinstall any winterized plugs or fittings: Remove expansion plugs from returns and reinstall eyeball fittings.

Step 2: Equipment Startup — Pump, Filter & Heater

Getting your equipment running properly is the foundation of a healthy pool. Don't skip this step!

Prime and start the pump: Make sure the pump basket is clean and the lid O-ring is lubricated. Fill the pump with water before starting to avoid running it dry.
Check for leaks: Once the pump is running, inspect all unions, valves, and fittings for drips.
Start the heater: Verify the gas supply is on (for gas heaters) or the heat pump is connected. Run a short test cycle to confirm it fires up properly.
Inspect the chlorinator or salt cell: Clean the salt cell if needed and check for calcium buildup. Inspect the chlorinator basket and O-rings.
Set your timer: Run the pump a minimum of 8–12 hours per day during the opening period to circulate and treat the water effectively.

Step 3: Filter Cleaning & Replacement

Your filter is your pool's kidney — it needs to be in top shape at the start of the season.

Cartridge Filters

Remove cartridge elements and rinse thoroughly with a garden hose. Inspect for tears, collapsed cores, or worn end caps. If your cartridges are more than 2–3 seasons old, it's time to replace them. We carry the full line of Pentair Clean and Clear Cartridge Filters — including the popular Clean and Clear Plus 420 and Clean and Clear Plus 520 — so you can get the right fit for your system.

Sand Filters

Backwash your sand filter until the sight glass runs clear. If your sand is more than 5 years old, consider replacing it with fresh filter sand for optimal filtration.

DE Filters

Backwash and recharge with fresh diatomaceous earth. If you haven't done a full teardown and cleaning in a couple of seasons, spring is the perfect time.

Step 4: In-Floor Cleaning System Maintenance

If your pool is equipped with an in-floor cleaning system — one of ePoolSupply's specialties — spring startup requires a few extra steps to make sure everything is flowing properly.

Inspect pop-up heads: Check each pop-up nozzle for debris or calcium buildup. Remove and clean any that aren't rotating or retracting properly.
Check the valve actuator: Verify the indexing valve is cycling through all zones. Listen for the click as it advances.
Flush the system: Run the in-floor system for a full cycle before adding chemicals to flush out any debris that settled over winter.
Inspect the booster pump (if applicable): Check the pump basket, prime it, and verify it starts on schedule.
Test all zones: Walk the pool perimeter while the system runs to confirm all heads are popping up and rotating correctly.

Pro tip from our team: If you notice any heads that aren't retracting, they may have debris lodged in the body. A quick removal and rinse usually does the trick.

Step 5: Water Chemistry Startup

This is the most critical part of opening your pool. Getting your chemistry balanced before you shock will make the whole process more effective and protect your equipment and surfaces.

Test Your Water First

Start with a fresh water test — either a home test kit or a professional lab test. You need to know your baseline before adding anything. We recommend picking up a quality test kit to keep on hand all season long.

Target Ranges

pH: 7.4 – 7.6
Total Alkalinity: 80 – 120 ppm
Calcium Hardness: 200 – 400 ppm
Cyanuric Acid (Stabilizer): 30 – 50 ppm
Free Chlorine: 1 – 3 ppm (after shocking)
Salt (for salt pools): 2,700 – 3,400 ppm (check your cell manufacturer's specs)

Balancing pH and Alkalinity

Always balance alkalinity first, then pH. If your pH is too high (above 7.6), bring it down with HASA Muriatic Acid — one of the most effective and economical pH reducers available. Add it slowly with the pump running, and retest after a few hours. Never add acid directly to the skimmer.

Calcium Hardness

Low calcium hardness causes water to become aggressive and can etch plaster or corrode equipment. If you're below 200 ppm, add calcium chloride to bring it up. High calcium (above 400 ppm) can cause scaling — especially on salt cells and heater elements.

Salt Pools

If you have a salt chlorine generator, check your salt level before turning the cell on. Most cells require 2,700–3,400 ppm to operate properly. Use Morton 40lb Commercial Grade Pool Salt to bring levels up — it's a clean, high-purity salt that dissolves quickly and won't cloud your water.

Step 6: Shock Treatment

After balancing your water chemistry, it's time to shock the pool. Shocking breaks down combined chlorine (chloramines), kills any algae or bacteria that developed over winter, and gives your sanitizer a powerful head start.

How to Shock Your Pool

Test and balance pH to 7.2–7.4 before shocking (lower pH makes shock more effective).
Shock in the evening or at dusk to prevent UV degradation.
Pre-dissolve granular shock in a bucket of water before adding to the pool.
Pour the solution around the perimeter of the pool with the pump running.
Run the pump overnight and retest in the morning.
Wait until chlorine drops below 5 ppm before swimming.

For a powerful, fast-dissolving shock, we recommend Poolife TurboShock Treatment. It's a 78% calcium hypochlorite shock that works fast and is available in convenient 1 lb bags or 25 lb buckets for the whole season.

Step 7: Establish Your Ongoing Chlorination Routine

Once your pool is shocked and balanced, set up your regular chlorination routine to keep it clean all season. Slow-dissolving 3" trichlor tabs are the most popular and convenient method for maintaining a steady chlorine residual.

Load up your chlorinator or floater with EZ-Chlor 3" Chlorine Tabs (50 lb Bucket). These tabs are stabilized with cyanuric acid, so they protect chlorine from UV breakdown and provide long-lasting sanitization. A 50 lb bucket is a great way to stock up for the season and save on per-unit cost.

Spring Pool Opening Checklist — Quick Reference

✅ Remove, clean, and store pool cover
✅ Inspect pool shell, fittings, and returns
✅ Reinstall winterization plugs/fittings
✅ Clean or replace filter media/cartridges
✅ Prime and start pump — check for leaks
✅ Test and start heater
✅ Inspect and flush in-floor cleaning system
✅ Test water chemistry
✅ Balance alkalinity, pH, and calcium hardness
✅ Add salt if needed (salt pools)
✅ Shock the pool
✅ Load chlorinator with tabs
✅ Retest water after 24–48 hours

Shop Spring Pool Opening Essentials

Everything you need to open your pool is available at ePoolSupply. Here's a quick roundup of our top spring opening products:

Have questions about your specific pool setup? Our team has 25 years of experience helping pool owners get the most out of their equipment. Contact us — we're happy to help.

The Ultimate Spring Pool Opening Guide: Get Your Pool Ready for the Season