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Poolking, your best swimming pool equipment manufacturer and supplier with more than 20 years experience.   ​​​​​​​  Email: sandy@poolking.co

Small knowledge of swimming pool filter sand tank maintenance

Determination of the critical point of backwashing: There is no uniform standard to define the pressure of this critical point in Pa, because the flow parameter of the filter sand tank is not exactly one of its parameters. Because it's just a container. It's like the size of the bowl has no direct relationship with how much a person eats (of course, if the flow rate is large enough and the sand filter tank is small enough, it will create greater resistance to the overall water flow, which will increase the energy efficiency of the pump and waste energy).

The main factors that determine the flow rate are the flow rate and pressure of the pump. The water flow rate of the filter sand tank is directly related to the flow rate of the front-end water pump. At the same time, the material of the filter material, the thickness of the sand layer, the thickness of the pipe, etc. can also affect the flow.

Therefore, the determination of the backwash critical point depends entirely on the operator's experience. Either according to the pressure, backwash after reaching a certain pressure, or on this basis, after comparing the cycle of each backwash, backwash can be performed according to the time period. About replacing the filter material: Generally, the quartz sand filter material does not need to be replaced.

Because it basically does not react with the filtered object. However, if the filter sand tank uses activated carbon as the filter material, the activated carbon will be saturated with iodine value after a period of adsorption, and needs to be replaced in time. Conversion of connecting pipe fittings for filter sand cylinders: All filter sand cylinders produced by Guangdong Boying are equipped with a set of metric and imperial PVC joints to meet the needs of customers in different regions.

If the union on the sand cylinder head does not match the pipe fittings of the external circulation, it can be changed by using a straight-through reducer. When performing various operations on the filter sand tank, care should be taken to ensure that the operation is carried out when the water pump is stopped. Do not press down the handle with too much force, so as not to break the handle.

The three pipes (water inlet, water outlet, and sewage) coming out of the filter sand tank should also be supported and fixed by brackets to prevent the weight of the pipe from increasing and falling when the water is flowing, which will cause the angle between the pipe and the joint to change, so that the joint at the joint will Unable to withstand excessive torque and rupture. Poolking is the best swimming pool equipment manufacturer and supplier in China. Poolking exists to provide the highest quality swimming pool equipment while offering competitive pricing..

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a.Firstly you can tell me the pool size such as wide, length and depth.The circulation period is 4 hours,then we can use the pool volume divide by 4 to know the flow rate.Based on this we can know choose the suitable model for sand filter and pump.
b.Usually 4 meters can install a pool light.Both ends of the pool can install the ladders.
The basic filtration equipment can be chosen like above method.The other accessories can be fixed according to the using environment and requirement.
---Poolking has a professional Quality Control team to guarantee each product is 100% inspected before packing. For example when the filter inner tank comes out, they will make a first water testing before bobbin wounding. After installation all the connections or manhole & sightglass, they will make the second water testing. During the packing procedure, QC team will inspect all the details like wounding, neck, internal resin and so on to make sure no leaking and without flaw.
----It is best to replace the silica sand of sand filters every 1-2 years for the following reasons:
a During backwashing, the filtration bed volume will expand upwards by 1.2 to 1.3 times. The water flow will drive the filtration layer to flow up and down, causing the filtration material particles to collide with each other. Backwash will let the small sand evacuate.
b.Some silica sands will be welded when the acid and alkali are changed due to insufficient purity;
Therefore, the longer the time, the worse the filtering effect of the sand tank. Since backwashing will consume and take away some sand, we need to replace the sand in the sand tank within the specified period.
After about 5~10days ,or when the reading of the pressure gauge on the pump side of the filter has increased by about 0.2bars since the last backwash , backwash the filter as follows:
1. Stop the pump
2.Close the valves on the suction and return lines.
3.Open the cover of the pump and empty the filter gasket .
4.Refit the cover
5.Open the valve to the drain outlet
6.Turn the lever to BACKWASH
7. Open the valves to the suction and return lines.
8.Start the pump .Rinse the filter for about 1 to 2 minutes until the water in the sight glass is clear .
NOTE : Any electric heater must be off .
9. Stop the pump
10. Turn the lever to RINSE , start the pump and rinse for about 15~30 seconds. Stop the pump and turn the lever to FILTER . This is the normal operating position .
11. Close the drain outlet valve and start the pump . Switch on the electric heater if any .
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Contact: Sandy

Email: sandy@poolking.co

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WhatsApp:+86-13922334815

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