Can areas of exposed concrete on the bottom a gunite or plaster pool be repaired with water in pool?

It is not advisable to attempt to repair exposed concrete on the bottom of a gunite or plaster pool while there is water in the pool. Pool water contains various chemicals, such as chlorine, that can react with the repair materials and compromise the quality of the repair. Furthermore, the water can interfere with the proper curing process of the repair material.

To achieve a successful and durable repair, it is best to drain the pool water below the level of the exposed concrete area. This will allow the concrete surface to dry thoroughly and ensure proper adhesion of the repair material. It's also advisable to clean and prepare the concrete surface before applying the repair material.

It is important to carefully follow the manufacturer's instructions for the specific repair material you plan to use. These instructions typically include guidelines on surface preparation, mixing, application, and curing time.

By draining the pool water and following proper repair procedures, you can ensure the longevity of the repair and the overall integrity of your gunite or plaster pool.