Sand is needed for a pool primarily to create a smooth, protective, and stable base upon which the pool liner sits. This prevents damage and ensures the longevity of the pool.
The Importance of a Sand Base
Using a layer of sand under an above-ground pool or as part of the construction of an in-ground pool is crucial for several reasons:
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Protection from Debris: Sand acts as a barrier between the pool liner and the underlying ground, which may contain sharp objects like rocks, roots, or debris. These objects can puncture or tear the liner.
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Smooth and Level Surface: Sand provides a smooth and level surface, eliminating bumps and depressions that can create weak spots in the liner and make swimming uncomfortable.
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Cushioning: Sand offers a degree of cushioning, absorbing minor shifts in the ground and reducing stress on the pool liner.
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Prevention of Rusting (for Metal Components): In some pool designs, a sand base can help prevent direct contact between the metal pool components and the soil, reducing the risk of rust and corrosion.
Types of Sand Used for Pools
Not all sand is suitable for pool bases. Play sand is commonly recommended due to its fine texture and ability to be easily compacted. Sharp sand or builder's sand may contain larger particles that can damage the liner.
How Sand Supports the Pool Structure
The sand layer essentially provides a uniform support system for the pool. Without it, the weight of the water would be concentrated on any irregularities in the ground, leading to uneven pressure and potential failure of the pool structure. The sand distributes this weight evenly, preventing stress points and extending the life of the pool.
