Deionized water activated carbon

Some information was found on other websites for reference: issues and steps related to the replacement of filter media in quartz sand filters and activated carbon filters. Quartz sand filter media and activated carbon are considered star products in the water treatment industry; they are the most widely used water treatment materials at present. Many companies use filters that combine quartz sand and activated carbon for filtration. So what problems might arise during their daily use? Today, Dacheng Water Purification will use some information provided by the customer service department to explain to you the precautions to take and the steps involved in replacing quartz sand and activated carbon filter media: 1. Tools required for replacing quartz sand and activated carbon: pipe wrenches, sand suction tubes, and electrical tape. 2. Before replacing the quartz sand and activated carbon, it is necessary to conduct a thorough inspection of the equipment to check whether there are any damaged parts in the customer’s equipment that have not been detected. If such parts exist, they should be reported to the customer promptly, and all operating parameters should be recorded, especially the inlet pressure of the quartz sand and activated carbon. 3. For shutting down the equipment, first, in the case of reverse osmosis systems, it is necessary to stop the main pump of the reverse osmosis unit first, then stop the feed water pump, and finally close off the inlet to the feed water pump. 4. When replacing the carbon sand, it is generally done by first changing the carbon and then the sand. This is because the newly added activated carbon needs to be soaked in water first to become fully saturated, thereby removing the air from between the carbon particles as well as from the gaps within them; this prevents the carbon particles from floating on the surface of the water, and it also helps to save time. First, add a small amount of water at the bottom of the carbon filter tank, and then fill it with activated carbon. 5. The packing volume of activated carbon is about 6% of the total volume of the carbon filter tank. To leave enough space for backwashing. After filling the carbon tank, add water to it so that the water can fully submerge the activated carbon. 6. Before replacing the quartz sand, a small amount of water should also be poured into the sand tank. The quartz sand should be filled in such a way that the larger particles are at the bottom and the smaller particles are on top; the volume of quartz sand filled should be about 80% of the capacity of the sand tank. 7. After filling the quartz sand, reinstall the equipment. Washable quartz sand: Before washing, make sure that the valves are opened correctly, namely the water inlet valve and the upper discharge valve; close the water inlet valve for the activated carbon. Then start the water pump, first for forward flushing, and then for reverse flushing. Then washing and rinsing are alternated. Until the water coming out of the wastewater valve becomes clear. 8. Ensure that the quartz sand has been thoroughly washed. Use a water pump to clean the activated carbon, first by washing it in the forward direction and then in the reverse direction, until the water flowing out is clear and colorless, with no fine particles present, at which point it can be put into use. When cleaning the activated carbon, turn off the water supply to the softener. Precautions: 1. Before replacing the sand and carbon, cover all electrical components that are near the sand tank and the carbon tank with water-proof materials such as plastic, to prevent water from entering the pump and causing it to get damaged. 2. When filling with sand charcoal, the center tube should be sealed with duct tape to prevent the sand charcoal from entering it. 3. When cleaning the sand carbon, it is necessary to first wash it in forward flow and then in reverse flow. During reverse flushing, pay attention to the pressure gauge; if the pressure exceeds 3 kg during this process, switch back to forward flushing immediately. 4. The filling volume of sand charcoal should not exceed 70% of the total volume to allow space for backwashing. 5. Generally, it is necessary to use raw water for cleaning without a pump, as the pressure of tap water is not sufficient for thorough cleaning, unless the pressure of the raw water is very high. Note: The use of quartz sand filter media and activated carbon in filter tanks is generally determined by the turbidity of the raw water, its pH value, as well as the conditions of maintenance in daily use. Typically, quartz sand filter media can last for 1–2 years, or even 1–3 years. Activated carbon possesses a highly porous structure, making it an excellent filtering material with strong adsorption capabilities; however, its lifespan also depends on how it is used. If it has been in use for a long time without ever being backwashed using a blowing device, it is recommended to decide whether to replace it based on the quality of the water output. I hope this can help you.

Filling process of quartz sand filter tanks and activated carbon filter tanks: Under normal circumstances, the filter media filled in a filter tank should account for about two-thirds of the tank’s height; too much media will affect the water flow rate, while too little media will result in inadequate filtering efficiency. 1. When filling a filter tank with quartz sand and pebbles, first lay a 20-cm-thick layer of pebbles (4mm–8mm) at the bottom of the tank. Next, fill it with quartz sand (2–4mm); the height of this layer should be about one-fifth of the total height of the filter tank. After that, add another layer of quartz sand (1–2mm), with a height of also one-fifth of the total height. Finally, add a layer of quartz sand (0.5–1mm); this layer should account for two-thirds of the total height of the filter tank. This is the sequence for filling a quartz sand filter tank. 2. The sequence and method for installing the activated carbon filter tank are similar to those for installing quartz sand. First, the filter media consisting of cobblestones at the bottom is replaced with quartz sand; a layer of 2-4 mm quartz sand is placed at the bottom first, after which coconut shell activated carbon is added, with the filling height being approximately three-fifths of that of the activated carbon filter tank. That is the sequence for loading activated carbon. 3. Commissioning of the quartz sand filtration tank: For backwashing, adjust the pressure to 6–8 units in order to make the water clear (during backwashing, the water turns milky white; this is normal due to the silica on the surface of the quartz sand). ) 4. Commissioning of the activated carbon filter tank: The backwash pressure is the same as that used for quartz sand; once the water becomes clear, the filter media can be allowed to settle slowly on its own. After debugging, check the effect of the discharged water. (Remember, when backwashing, make sure that clean water comes out.)