The working principle and installation of swimming pool sand tank filter

1. Working principle The sand tank swimming pool filter uses special filter sand to remove tiny dirt in the pool water. As the medium for removing dirt, the filter sand is filled in the cavity of the swimming pool filter. When the control knob is turned to "FILTER filter " position, the pool water containing suspended dirt particles is pressed into the filter pipeline by the water pump, and then guided by the control valve to the water outlet of the pool filter, the pool water flows through the sand bed, and the tiny dirt is captured by the sand bed Filtered out, the filtered clean water is returned to the swimming pool from the bottom of the pool filter through the control valve and then through the pipeline. This whole set of procedures is continuous and automatic, and provides a complete cycle process for the pool filter and piping system. The sand tank swimming pool filter has been used for a period of time, and the accumulated dirt hinders the water flow and weakens it. At this time, the swimming pool filter must be cleaned. Turn the control valve to the "BACKWASH backwash" position, then the water flow will flow in the opposite direction, and the water flow will directly reach the bottom of the swimming pool filter cavity, and then backwash up through the sand layer to remove the previously captured dirt, The residue is washed up and discharged from the sewage outlet. After each backwash, the control valve should be turned to the "RINSE flushing" position, and the water pump should be turned on to remove the dirt in the sewage pipe, and then turned to the "FILTER" position to resume normal filtration.

2. Installation of swimming pool filter The installation and maintenance of sand tank swimming pool filter is very simple, only need screwdriver, wrench, PVC glue and sealing tape for sealing plastic union. 1. The sand tank swimming pool filter should be placed on horizontal concrete or a solid surface with comparable hardness. In addition, the location where the sand tank swimming pool filter is installed should be convenient for the connection of pipelines, the operation of the control valve and the maintenance of the sand tank swimming pool filter . 2. Filling of the filter sand, the filter sand should be filled from the upper opening of the swimming pool filter.

(1) Loosen the nut and remove the control valve of the swimming pool filter (if the control valve has been installed); (2) Cover the mouth of the plastic pipe with a plastic protective cover to prevent filter sand from entering; (3) Refill Before sand filtering, we require half of the water to be injected into the swimming pool filter cavity, which acts as a buffer and prevents damage to the tank and internal devices when the sand is put in. (4) It is required to fill filter sand of correct grade and weight (20# silica sand). The surface should be in the middle of the pool filter cavity, then remove the guard. 3. Install the control valve on the swimming pool filter (1) The control valve (with sealing ring) is put in from the upper port of the swimming pool filter. Pay attention to align and insert the central tube in the swimming pool filter and the hole at the bottom of the switch. ; (2) Tighten the nut with a wrench to connect the control valve and the pool filter; (3) Install the pressure gauge (with sealing ring) on ​​the screw hole of the control valve body, do not overtighten.

4. The nozzle marked "PUMP" on the valve body is connected to the water pump, the pipe returning to the swimming pool is connected to the nozzle marked "RETURN" on the control valve, and the nozzle marked "WASTE" on the control valve is connected to the sewage pipe. 5. Connect the water pump separator to the water inlet of the water pump, and install the water pump suction pipe. 6. For the connection of the water pump power system, the water pump should be equipped with a suitable leakage protection switch.

7. Check the firmness and tightness of the pipeline connection, and no leakage is allowed. 3. Use of swimming pool filter 1. Check and confirm that the connected objects of the sand tank swimming pool filter and the power supply of the water pump are safely connected; 2. Press down the handle of the control valve and turn it to the "BACKWASH" ​​position (to prevent damage to the seal of the switch turn, the handle must be pressed before turning). 3. Start the water pump (to ensure that the water suction and return pipes are unblocked), the pool filter can be filled with water in advance, once the water flows into the connected sewage, the pump will continue to run for another 4 minutes.

4. Turn off the water pump, turn the control valve handle to the "RINSE flushing" position, start the water pump until the observation bottle becomes clear water and keep it for 1 minute; turn off the water pump, turn the control valve to the "FILTER filter" position, restart the water pump, now the swimming pool The sand tank filter is functioning properly, removing dirt from the pool water. 5. Adjust the water suction and return valves of the swimming pool to meet the required water flow, and check the tightness and firmness of the piping system connections. 6. When the inside of the filter is clean, write down the reading of the pressure gauge (his change will depend on the entire piping system of the water pump), the pool filter will filter out the dirt from the pool, and the accumulated dirt will cause the pool filter to fail. When the pressure rises, the water flow becomes smaller. When the reading of the pressure gauge is above 150KPa, which is greater than its cleaning reading, then the swimming pool filter should be "backwashed".

4. Function description of the multi-choice valve of the swimming pool filter 1. FILTER filter: normal filter to clean the pool water. 2. BACKWASH backwash: discharge the dirt accumulated in the swimming pool filter. 3. RINSE flushing: discharge the dirt in the sewage pipe.

4. RECIRCULATE cycle: water is circulated without going through the pool filter. 5. WASTE sewage discharge: direct sewage discharge without filtering. 6. CLOSED: Close the function of the swimming pool filter.

7. SERVICE maintenance: to remove the horizontal pin of the handle during maintenance. (Only 11/2"multi-choice valve) 8. WINTERIZE cold protection: prevent the main body of the swimming pool filter from being damaged when the temperature is too low. (Only 11/2"multi-choice valve) Note: Before changing the position of the valve switch, the pump must be stopped.

V. Precautions 1. When the working pressure of the swimming pool filter exceeds the maximum working pressure: 350kPa, the main body, cover, valve and other pipe fittings of the swimming pool filter may burst, causing serious accidents. If the circulation system is subject to high pressure, It is necessary to install an automatic valve or pressure regulator in the circulation system to automatically relieve the pressure for the minimum working pressure of each component of the circulation system. 2. The swimming pool filter operates under high pressure. When any one of the circulation devices (pipelines, pumps, filters, valves, etc.) is operated, the gas can enter the system device to generate pressure, and the compressed gas can cause casualties and property loss and other serious consequences. 3. The temperature of the water flowing through the swimming pool filter shall not be higher than 50°C. 4. Before changing the position of the valve switch, the water pump must be stopped.

5. Regularly clean the filter screen of the water pump separator to avoid malfunctions in the operation of the water pump and filter system. 6. When the water pump is running, do not remove the flange nuts connecting the pipeline. 7. The filter system must not run without water, so as not to burn out the mechanical seal.

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