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You shouldn’t install a new vinyl pool liner on top of an old liner as it can cause problems. For instance, once you drain your pool to install the new liner, the existing liner can dry out and become brittle. This can lead to deterioration that affects the condition of the new liner. Other types of pool liners can go directly over old liners safely, but you should always defer to a professional for the best course of action.

Swimming pool liners are typically made out of vinyl, or you can commonly find PVC pool liners. These two liner materials are low-maintenance, making them easy to care for. Vinyl pool liners are common for residential swimming pools, while PVC liners are popular for commercial swimming pools. Both options are highly customizable to fit various sizes and shapes of pools.

The recommended PSI (pounds per square inch) for cleaning vinyl siding can vary, so it's best to consult the manufacturer's guidelines. Generally, vinyl siding can handle high pressure, from 2,500 to 3,500 PSI. For comparison, more delicate materials like wood and aluminum siding should not face more than 1,500 PSI. To safely disperse the pressure on vinyl, use a tip with a wider spray span, such as a green (25-degree) or yellow (15-degree) nozzle. For routine cleaning of light dirt, a garden hose with a spray nozzle may be sufficient. Always exercise caution to avoid using excessive pressure that could damage the siding.

You don’t need to drain the whole pool to patch a pool liner, but be prepared to dive in with your swimsuit and goggles to patch a leak below the water level. By draining the pool, you can actually expose the liner to more harsh conditions, like wind and sunlight, that cause the tears to worsen. It’s best to use the ink test and waterproof patches or tape to identify the leak and patch it up.