In pool maintenance, the quartz sand in the sand tank plays a crucial role. Over time, the sand tank may accumulate dirt and impurities, affecting water quality and the normal operation of the pool system. Therefore, understanding the correct cleaning method is essential for maintaining a clean and healthy pool. This article will introduce the proper cleaning method for quartz sand in the pool’s sand tank to ensure clear water quality and efficient operation of the pool system.
Working Principle of the Pool Filter Sand Tank
The sand tank utilizes specially designed filter sand to remove tiny impurities from pool water. The filter chamber is filled with filter sand, serving as the medium for purifying impurities. The following is a detailed description of the working process of the sand tank:
- Water Flow into the Sand Tank: Pool water enters the sand tank through the pool system’s pipes, flowing into the chamber of the filter.
- Filter Sand Captures Tiny Impurities: After entering the filter, pool water passes through the sand bed, where the filter sand captures and intercepts tiny impurities, solid particles, and suspended matter. This gradual process purifies the water through the sieving action of the filter sand.
- Filtered Water Returns to the Pool: After purification through the filter sand layer, the filtered clean water returns to the pool through the control switch at the bottom of the filter via the pipeline. This ensures that the water in the pool has been effectively filtered, removing tiny impurities and maintaining clear water quality.
- Continuous Automatic Circulation System: The entire process is continuous and automatic, ensuring that the sand tank maintains the cleanliness of the pool water. This cyclic system guarantees the continuous purification of water quality while providing a complete working cycle for the filter and pipeline.
Reasons for Cleaning Quartz Sand
During the circulation process, the sand tank traps suspended particles in the water. When these particles reach a certain level, it affects filtration speed and quality, making cleaning necessary.
Detailed steps for cleaning quartz sand
1、Backwashing Technique in the Sand Filter
Backwashing is employed to remove suspended particles trapped in the sand tank, restoring filtration capacity. Controlling the speed and duration of backwashing is crucial. When using quartz sand as the filter medium, the backwashing intensity should be no less than 15L/(S.m2), and the backwashing time should be 5-6 minutes or until backwashing water shows no suspended particles.
2、Sand Tank Backwashing Procedure
Using water or air-water introduced from the opposite direction of the filtration inlet, the sand tank’s backwashing process loosens the filter bed, facilitating the removal of debris accumulated on the filter bed’s surface, restoring the filter’s filtration performance.
Cleaning the sand tank involves using water or air-water from the opposite direction of the filtration inlet to loosen the filter bed, clearing the debris accumulated on the filter bed’s surface. This process aims to restore the filter’s filtration performance, ensuring effective filtration, water circulation, and reducing the energy consumption of the circulation water pump. Practical experience shows that backwashing is more effective for filters with a diameter smaller than 1600mm, aligning with current economic conditions.
3、Air Wash Followed by Water Wash
Performing an air wash before a water wash not only effectively removes oil and fats but also minimizes the required water volume. In large, comprehensive swimming pool facilities with a high number of swimmers and significant variations in swimming load, and rapid water contamination, if the filter diameter exceeds 2000mm, it is recommended, if conditions allow, to use a combined air and water backwashing method to ensure the effectiveness of backwashing in quartz sand filters.
By adopting appropriate cleaning steps, you can ensure that the quartz sand in the pool’s sand tank remains clean, providing clear water quality. Regular cleaning not only helps extend the lifespan of the pool system but also provides a safe and healthy swimming environment. Remember, the key to pool maintenance lies in regular inspections and meticulous cleaning, keeping your pool in optimal condition for you and your family to enjoy a delightful aquatic haven.