What to Do After Rain: Above Ground Pool Care & Maintenance

Heavy rainfall can turn your above ground pool into a murky ecosystem overnight. Leaves, dirt, and other debris often accumulate, while the water chemistry gets completely thrown off balance. Acting quickly after a storm is the most effective way to prevent minor issues from becoming major problems that shut down your pool for the season.

The Immediate Aftermath: Skimming and Surface Cleaning

The first hour after the rain stops sets the tone for the entire recovery process. You need to address the physical debris before it has a chance to sink and stain the liner. This step is non-negotiable for maintaining water clarity.

Skimming the Surface

Use a long-handled skimmer net to remove leaves, insects, and pollen that have settled on the surface. Rainwater often washes organic matter into the pool, and if left to decay, it will turn the water green and deplete the chlorine. Focus on the corners and the waterline where debris tends to collect.

Wringing Out the Deck

Rainwater runoff from your deck or lawn often carries fertilizer, soil, and contaminants. Use a pool rake or a wet/dry vacuum to clean the area surrounding the pool and the top few inches of the coping. You don't want this dirty water slowly re-entering the pool as it drains later.

Testing and Rebalancing the Water Chemistry

This is the most critical step many homeowners overlook. Rainwater is acidic and usually has a low pH. When it mixes with your pool water, it dilutes the chemicals and creates an environment where bacteria and algae thrive. You must test and adjust the water immediately.

Start by testing the water with a high-quality kit. You will likely need to shock the pool heavily to burn off the organic material the rain introduced. Follow the dosage instructions carefully and allow the filter to run continuously until the water clears.

Filter System Maintenance and Operation

Your filter is the workhorse during the recovery phase. Rainwater introduces a massive load of particulate matter, which can clog the system quickly. You need to optimize the filter to handle the increased workload.

Backwashing and Cleaning

Check the pressure gauge on your filter system frequently. A drop in pressure or cloudy water indicates the filter is full. If you have a sand or DE filter, you will need to backwash it to flush out the trapped debris. In severe cases, you may even need to dismantle and manually clean the grids or cartridges to ensure maximum flow.

Running the Pump

During and immediately after rain, run the pump 24/7 if possible. Continuous circulation prevents stagnation and helps the sanitizer work effectively. Once the rain stops and the debris is cleared, run the pump for at least 8 to 12 hours a day until the water is clear and the chemical levels are stable.

Addressing Water Level and Overflow

Above ground pools have a structural maximum water level. Heavy rain can cause the pool to overflow, which creates two distinct problems: safety hazards and structural stress.

If the water level is too high, partially drain the pool using a submersible pump. You must maintain the water level halfway up the skimmer opening for optimal performance. Conversely, if the rain caused a rapid drop in water level due to a leak, inspect the liner for punctures or tears once the water settles.

Preventing Future Deluges

Recovery is important, but preventing the damage in the first place saves time and money. Investing in a few preventative tools can significantly reduce the workload after every storm.

• Install Rain Caps: These are custom-fit covers that sit on the skimmer and over the top rail. They collect rainwater and allow you to pump it out before it mixes with the pool water.
• Use a Pool Cover: A solid safety cover or winter cover kept on during heavy weather blocks 90% of the debris and rainwater from entering the pool.
• Improve Drainage: Ensure the ground around the pool wall slopes away from the structure. This prevents groundwater pressure from pushing the walls out of alignment and keeps the surrounding area drier.