If the water is stopped at home and the water is reopened, you will find that the water is very dirty, and fine particles can be seen, indicating that the tap water is polluted. In fact, rusting of old cast iron pipes, damage to underground pipes, repair or replacement, etc., will lead to the outflow of particulate impurities in household tap water.
Is there any way to prevent these contaminants from getting into our home water pipes?A pre-filter can be installed!
When should I install a pre-filter?
The German ** legislation of 1988 (DIN 1988) stipulates that all buildings built thereafter must be equipped with protective impurity filters.
The harmful substances in the water are different in size and characteristics, such as some are large-particle impurities, some are micro-particle impurities, and some are water-soluble harmful substances, so household water treatment should be cleaned and filtered from coarse to fine.
The pre-filter is the first safety protection for household water purification, which is installed behind the household water meter and on the main water inlet pipe, which can filter large particles of impurities and flocculents such as sediment and rust in the tap water, and protect the pipeline, faucet, washing machine and other water-related appliances and subsequent water purification equipment.
Therefore, it is recommended to install pre-filters when using long-distance water pipes, rooftop water tanks, mountain spring water and other water sources containing more impurities, as well as when installing more equipment in the pipeline.
How to choose a pre-filter?
The common pre-filters on the market are strainer type and laminated type, and the filter type is available without backwashing device and with backwashing device.
Choose laminated
The filter screen of the filter screen pre-filter is easy to be blocked by the impurities filtered down, and after the blockage, not only some impurities cannot be flushed out, but the deeper and tighter the filter is embedded in the filter screen the more it is flushed. When the influent water contains flocculents, it is more likely to stick to the filter screen and is difficult to rinse clean.
The impurities trapped by the laminated pre-filter will not block the filter holes, and will not be flushed out because the impurities are embedded in the filter holes.
When the water passes through the lamination, the filter lamination is tightly pressed together under the combined action of spring and water pressure, impurities and particles are trapped at the intersection of the lamination, and the filtered water flows out of the filter.
Choose a backwashable one
According to the flushing method, the pre-filter can be divided into three types: flush type, backflush type and siphon type, among which the backflush type has the best flushing effect.
The flush type is to open the flushing valve at the bottom of the filter and let the water wash the surface of the filter screen, so that the trapped impurities are washed away by the water.
The backflush type is to open the flushing valve to change the direction of the water flow, flush from the inside to the outside, and discharge the impurities trapped on the surface of the filter screen and the mesh from the sewage outlet.
The siphon type is to open the flushing valve to let the water flow around the filter element to form a negative pressure and disordered vortex flow, and the impurities trapped on the surface of the filter screen are sucked into the sewage pipe through the siphon groove and washed away by the water.
Runlai laminated pre-filter has a patented design of high-efficiency automatic backwashing function (patent number: ZL2016205524652）。
When backwashing, the ceramic sheet rotates relatively, changes the flow channel instantly, changes the external pressure to the internal pressure, the water pressure counteracts the pressure of the spring, the lamination automatically and evenly loosens, rotates and scrubs, and the sewage outlet is opened at the same time, which can easily and quickly rinse the trapped impurities, and completely solve the problem of impurities blocking the filter element.
At the same time, it comes with a sewage outlet, so the filter element is installed upwards, and it only takes more than ten seconds to discharge the trapped impurities directly from the sewage outlet and flow away from the sewer during backwashing, which can not only maximize the clean discharge, but also discharge instantly.
Select the appropriate filtration precision
The pre-filter is the first coarse filtration device in the family, which can filter large particles of impurities in tap water, and it is recommended to choose a pre-filter with appropriate filtration accuracy, which can not only ensure the filtration effect, but also do not affect the water pressure. If the pre-filtration accuracy is too low, many impurities will not be filtered out, and the accuracy is too high, which will affect the flow rate and be more likely to be blocked.
The accuracy of the Runlai pre-filter is about 50 microns, which can effectively filter large particles of impurities and flocculents that are thicker than a human hair, and at the same time, the water pressure loss is small.