Maintaining Your Pool During the Off-Season
While keeping a swimming pool in good condition over the summer is relatively straightforward, the task can become daunting as the colder months approach. With the arrival of autumn, pool owners often face challenges like falling leaves, dirt accumulation, and freezing temperatures. Many choose to drain their pools to simplify maintenance during winter. However, is this practice truly beneficial?
How long can you leave a pool empty?
It is generally inadvisable to leave a pool empty for prolonged periods. The sustained absence of water can exert external pressure on in-ground pools, potentially leading to structural damage. Above-ground pools, when drained, are also vulnerable to damage from environmental factors. In essence, if you’re contemplating draining your pool for winter or maintenance, it’s best to do so for the shortest duration possible to prevent long-term harm. The following sections will delve into how to properly manage pool drainage and maintenance to ensure its longevity.
How Long Can a Pool Stay Empty?
The consensus among pool experts is to keep your pool drained for the least amount of time feasible. Understanding your pool’s construction can provide insight into how long it can safely remain empty. Some pools can withstand being drained for longer periods, while others may suffer damage if left empty for even a brief duration.
Types of In-Ground Pools
In-ground pools typically fall into three categories, each constructed with different materials:
Concrete Pools
Concrete pools are the most widely used type and offer a high level of customization alongside robust durability. As the most expensive option, they are built to last. Despite their strength, it is crucial not to leave a concrete pool empty for an extended period. Direct sunlight and environmental exposure can lead to erosion and cracks in the pool’s surface, damaging its integrity.
Vinyl Lined Pools
Vinyl-lined pools are increasingly popular due to their lower initial cost. They are typically constructed with wall plates made from vinyl, plastic, or steel. However, these pools are not designed to be emptied. If draining becomes necessary, it’s advisable to consult a professional, as specialized bracing is required to prevent damage during the emptying process. Fortunately, small repairs can often be carried out underwater with appropriate tools.
Fiberglass Pools
Fiberglass pools represent the third type of in-ground pool. These are pre-manufactured off-site and installed in a hole that is shaped to fit the shell. The surrounding area is then backfilled to secure the structure. It is highly recommended that fiberglass pools not be emptied, as they are at the highest risk of severe damage when drained. The design of a fiberglass pool relies on water pressure to maintain its shape, making it vulnerable to structural issues if emptied. Consulting a professional is essential if draining becomes unavoidable, as specific measures must be taken to brace the shell.
Above-Ground Pools
Another common type of pool is the above-ground variety, which is often purchased online or from a retail store. These pools can typically be assembled by the user. As water fills the pool, its sides take shape, and metal framing supports its structure. It is advisable not to drain an above-ground pool unless you plan to disassemble and store it for winter. If you do decide to take it down, ensure that the materials are completely dry and stored in a climate-controlled environment to prevent mold and mildew growth.
If you choose to leave water in the pool—common in cases where the pool is decked—make sure to cover it and have a method for removing excess rainwater. Additionally, any electrical systems, such as pumps, should be unplugged for safety.
What Can Happen to a Pool If Left Empty?
Even though pools are designed to endure various conditions, leaving them empty for too long can result in:
- Cracks
- Leaks
- Foundation damage
- Damage to pool accessories (such as lights, heating systems, and pumps)
- Damage to the surrounding landscape
Another potential issue is a phenomenon known as “float,” which occurs when groundwater fills the space between the pool shell and the earth beneath. While float is relatively rare, it can happen with neglect. The costs associated with repairing such damages can be significant and time-consuming, making it advisable to seek professional assistance for any maintenance tasks beyond routine cleaning, particularly those involving draining.
The extent of damage can also vary based on several factors:
- The water table level
- The weight of surrounding structures
- The geographical location of your pool
- The material of the pool itself
How Can I Leave My Pool Empty?
If draining your pool is necessary, be aware that prolonged exposure to the elements can lead to erosion or unbalanced pressure buildup from surrounding earth, resulting in cracks and leaks. However, there are ways to protect your pool during this time. For instance, utilizing hypostatic pressure release valves, which are built into the foundation of in-ground pools, can help alleviate some pressure. Breaking the plaster lining to access these valves allows water from the surrounding shelf to flow into the pool, reducing stress on its structure.
In addition, a drainage pump connected to a hose is essential for managing water buildup, particularly in above-ground pools. Ensure the hose directs water to a storm drain or an area with a natural slope away from the pool to prevent groundwater accumulation, which could lead to foundation damage.
How Do I Maintain a Pool without Draining it?
In-ground pools, especially concrete ones, demand considerable attention and care. Concrete is porous, creating an ideal environment for algae, which can be a significant challenge. If your pool is particularly dirty or odorous, draining and cleaning may seem like the only option. However, in many cases, consistent maintenance can keep your pool in excellent condition without needing to drain it.
Regular cleaning and upkeep can ensure your pool remains a beautiful and inviting space. If you’re not keen on handling the labor yourself, consider hiring a professional cleaning service. Alternatively, if you decide to take on the task, following these simple steps can help maintain a clean and sanitary pool:
- Skimming the surface
- Backwashing the filter
- Vacuuming the pool floor
- Monitoring and balancing chemical levels
Conclusion
While it may be tempting to drain your pool at the end of the swimming season for easier cleaning and maintenance, doing so can lead to more harm than good. In-ground pools are designed to withstand various conditions, but prolonged emptiness can result in leaks and cracks due to external pressure from the surrounding earth. Additionally, debris and dirt that accumulate in an empty pool can erode its surface, potentially causing water seepage and further structural issues.
The best approach to avoid these problems is to consult a local pool professional or cleaner for maintenance assistance or to continue caring for the pool yourself with regular skimming, backwashing, vacuuming, and chemical balancing. If you absolutely must empty your pool, be sure to limit the duration to minimize the risk of damage and excessive repair costs.