Ideally, the DE forms a uniform “cake” between 1/16 and 1/8 inch thick. In many cities and counties across the country, pool filtration rates are regulated. To describe this situation in a different way, calculations for your 29,920 gallon pool show that you need a flow rate of 62.3 gpm to filter the pool capacity in eight hours. Therefore, their goal is to determine which filter model filters 62.3 liters of water per minute, resulting in a full rotation every eight hours in the pool in question. Flow rate is the volume of water that flows along a certain point over a period of time, measured in gallons per minute or gallons per hour.
As you can see in our scheme of a DE pool filter, they are indeed a more complicated filter. Many more pieces, but mechanically just as easy to understand. Water enters through the lower inlet pipe or the lower drain and is pushed through the filter grids covered with DE filter powder. The filtered aquarium equipment water leaves the grates as it enters the upper collector and soon leaves the filter, through the vertical pipe and the upper screen fitting. Sand filter tanks are usually rotomolded, especially in smaller sand filters. Larger tanks may use a fiberglass or other spun fiber and resin design.
Carefully examine the grilles, sides, cartridges and collectors each time you break a filter to clean it and always take the time when reassembling. Careless reassembly after cleaning is the cause of more leakage than anything else in the filters. Filter must be disassembled, cleaned and refilled at least once a year. And it’s a dirty job, no matter how much it helps to facilitate the overall task of pool maintenance. Pressure gauges detect operating problems in the system.
Never change the position of the piston when operating the pump. This puts too much pressure on the pumps, motor and valve O-rings and can lead to leakage. The piston type backwash valve is usually located on the side of the filter tank. To achieve that goal, you need to find a filter whose filter flow corresponds to the desired flow rate for the pool. Filter flow is defined as the amount of filtered water over a given period of time, expressed in gallons per minute. Selecting a good filtration system is the key to healthy, clean, sparkling water in the pool or spa.
Given a typical flow rate of gpm per square foot of filter surface, most manufacturers recommend rewinding for 2-3 minutes. As always, it’s a good idea to check the manufacturer’s service manuals for specific rewind procedures. The operating pressure ranges for filters vary greatly depending on the type. Once the filter is installed on the pad, all sanitary connections are set and the unit is properly grounded, it is time to fully commission the circulation system. The three main types of filters (sand, DE and cartridge) require different commissioning procedures. As mentioned above, the following are general guidelines for your reference; The manufacturer’s manuals will give you the specific help you need.
When installed in the backwash line and when the water goes directly to the drain, the peephole helps to see the dirty water being cleaned and it’s time to stop backwashing. You should now consult the filter manufacturers to find a model with the necessary filter area and filter speed. Once these figures have been provided by the respective manufacturers for different models, you can calculate the filter flow rate to see which specific filter meets the need. This filter consists of a tank with a series of dust-covered grates, also called filter elements. The substance is covered with a means of filtration substance called DE, or diatomaceous earth. DE is the fine, white powder that occurs in large deposits in the soil.
Sand filters have a diameter of 2 to 4 feet and look like large balls. Older models are usually housed in metal tanks. The sand in the filter filter filters out impurities while the water finds its way. Water enters the top or side of the filter via a multiport backwash valve or piston and sprays on the sand. The sharp edges of the granules capture impurities.
Dirt and oil have a way of accumulating between these folds. The acid can only cause the organic material in the fabric net to harden, making it impermeable to water. Soak the cartridge for an hour in a garbage can with trisodium phosphate and hydrochloric acid.
As the medium becomes clogged with dirt, the pressure of the influent will be greater than the effluent value. When the difference between the measurements reaches a certain level, it is time for backwashing. As dirt accumulates on the filter medium, the flow of water is restricted and the pressure in the tank increases.