Winterizing a pool can be a tricky process, and several things can go wrong if not done properly.

One of the most important steps is removing all the water from the plumbing lines.

If even a small amount of water is left behind, it can freeze and expand, causing cracks or burst pipes. Blowing out the lines with an air compressor and using antifreeze for added protection in hard-to-reach areas is essential.

Another common mistake is incorrectly adjusting the water level. If the water is too high, it can damage the skimmers when it freezes. Conversely, if it’s too low, it can put undue pressure on the pool walls. It’s important to follow guidelines on the proper water level for your specific pool type and climate.

Properly winterizing pool equipment is also essential. Failing to drain the pump, heater, or filter can lead to freeze damage, so everything must be completely drained and secured. Skipping or incorrectly applying pool chemicals before closing can cause problems like algae growth or poor water quality in the spring.

Balancing the water chemistry and adding shock and algaecide before covering the pool helps prevent these issues.

Another common issue is using the wrong type of pool cover or not securing it properly. A cover that doesn’t fit or is poorly installed can allow debris to enter the pool or can sag under the weight of snow or rain, potentially tearing. Ensuring a snug fit and securing the cover with water bags or clips helps avoid these problems.

Forgetting to clean the pool thoroughly before closing is another mistake that can lead to stains or clogged filters from decomposing leaves and organic matter. It’s important to vacuum, brush the walls, and skim the surface before covering the pool to start the winter season with a clean pool.

Neglecting the pool’s tile and walls can also result in damage from freezing water along the waterline. Lowering the water below the tiles and using a floating ice compensator can help protect against freeze expansion.

Many pool techs also overlook the importance of preparing the area around the pool. Remind customers to avoid leaving furniture or tools nearby and to make sure to trim any overhanging branches, which can result in debris falling into the pool or damaging the cover.

Closing pool valves improperly or leaving them open is another problem that can allow water to flow back into the system, risking freeze damage or water loss. Checking that all valves are in the correct position is a critical final step. Finally, mistiming the winterization process can lead to issues. Closing the pool too early, while the water is still warm, can encourage algae growth, while waiting too long could result in freezing temperatures before the pool is properly prepared.

The best time to winterize is when the water consistently stays below 65°F, which reduces algae growth but still allows time to protect the pool before a freeze hits.

By avoiding these common mistakes and following best practices, pool techs can ensure their customers’ pools are well protected throughout the winter, making spring reopening easier and less costly.