Comparison RAIFIL HMF-20B vs RAIFIL PS898B1-BK1-PR

— Jug. Filter in the form of a jug, divided into two halves. Water is poured into the upper half, which looks like a funnel, which under its own weight passes through the filter cartridge to the lower part. Such devices are simple in design and use, as well as low cost. On the other hand, their productivity is low, the capacity usually does not exceed 2 – 3 L, and each time such a filter needs to be filled manually. For an ordinary kitchen for a family of 3–4 people, these shortcomings are not critical, but for large volumes of cooking with intensive water consumption, the filter jug is poorly suited.

— Nozzle on the tap. As the name implies, filters of this type are designed to be installed directly on the spout of a water tap, from the outside. They are easy to connect and use, and in a certain sense more convenient than jugs, because they do not require filling — filtration begins immediately when the tap is opened. Their resource and productivity are also usually higher; in addition, it is worth highlighting the low cost and small size that allowing you to carry the filter with you. Thanks to the latter, among such models there are options that can be installed on a bottle and used as travel filters (see below). The main disadvantages of nozzles are low productivity, as well as the need for regular connection and disconnection, which leads to rapid wear of the attachment.

— ...href="/list/219/pr-10338/">Tabletop. Filters of this variety are separate devices that are installed on the kitchen table (or other suitable surface). They are usually connected to a tap (see "Connection") using a flexible pipe. Such filters are less transportable than the nozzles described above, and are designed for permanent installation in one place. On the other hand, their productivity and resource are usually much higher. An obligatory element in the design of table filters is their own tap (see "Tap").

— Under the sink. Filters designed to be placed under the sink. When installed, they are connected to the water supply (see "Connection"), and a separate tap is brought out to supply filtered water (usually next to the main kitchen tap, but in fact it can be installed anywhere). Such filters usually have a fairly high performance and a good degree of filtration, they are useful for constantly providing the kitchen with filtered water, including for drinking. Of the shortcomings, it is worth noting the difficulty in installation — it requires the participation of a specialist.

— Main (mesh). Main filters are called filters designed to be inserted directly into the water supply system — for example, at the entrance to an apartment. Accordingly, one of the characteristic features of such models is high performance. Mesh — the simplest kind of main filters, equipped with filter elements in the form of a fine mesh, as the name implies. They purify water only from mechanical impurities and are used mainly as a preliminary stage of purification. From models with a cartridge (see below), which can also be used for purely mechanical filtration, models with a mesh are reusable: usually the design provides for the possibility of washing the mesh, restoring its original state.

— Main (with a cartridge). Main filters (see above), which provide the use of replaceable cartridges and are equipped with the appropriate cartridges. Such a design provides more opportunities than mesh models, main filters with a cartridge are capable of providing different types of filtration, including multi-stage cleaning. And the presence of a cartridge in the kit allows you to use the filter right out of the box, without buying additional accessories. At the same time, "native" filter elements are not always optimal, and sometimes a model without a cartridge is more preferable (see below).

— Main (without cartridge). Main filters (see above), which provide the use of replaceable cartridges, but are not equipped with such cartridges. This configuration has its advantages: although the purchase of filter elements requires additional time and money, but you can choose cartridges at your discretion, without relying on the choice of the manufacturer. Sometimes it is easier to collect a filter from a housing and individual filter elements than to buy a ready-made solution.

— Pre-filter. This category includes pre-filters, which are installed not at the entrance to the apartment (as main ones, see above), but in front of a separate household unit, usually a washing machine or dishwasher. Such devices have good performance and are often equipped with water softening systems to prevent limescale formation. The degree of purification in them is relatively low, but this is usually quite enough — since the water in this case is used not for food, but for technical purposes.

— Tourist. Filters designed for use in tourist trips. A common feature of all such models is their small size, which allows you to easily carry the device with you in a backpack or even a pocket. But the design of such a filter may be different. So, some models are containers with filter lids, others are nozzles put on a plastic bottle or other similar container; there are tourist models in the form of a pump capable of pumping water from a stream, lake or other natural reservoir, etc. It makes little sense to buy such a filter for home use, but for “being far from civilization” it may turn out to be simply irreplaceable.

— Cleaning and softening system. Devices designed not only for cleaning, but also for softening water — removing hardness salts and/or dissolved ferrous from it. "Hard" water is undesirable for home use: in particular, it reduces the effectiveness of detergents and leads to the formation of scale in kettles, on heating elements of washing machines, etc. Cleaning and softening systems are divided into two types: actually softeners and iron removers. The first variety uses a special ion exchange resin that traps hardness salt ions (calcium and magnesium) and replaces them with "soft" sodium ions. Such resin must be periodically restored. In iron removers, in turn, a special catalyst is used that oxidizes soluble ferrous to insoluble ferrous — and it is already filtered out mechanically. To which particular variety this or that system belongs — it is worth specifying separately.

— Magnetic. A special kind of main filter installed to the pipeline. However, due to its small throughput, it is not intended for full-fledged water supply, but for connection to household devices, whether it is a boiler, a washing machine or a dishwasher. The main function of these filters is water softeners, which prevents plaque and buildups, it is accordingly prolongs the life of the equipment.

— For shower. Models of filters for installation together with a shower head or in front of a hose. Made in a compact size and have a connecting thread for the hose. This solution will help purify the water (only for one connection point) and get rid of clogged openings in the shower head, because the plaque from contaminated water will be much less.

The smallest size of foreign particles (in microns) that the filter can hold in total. Accordingly, the smaller this size, the higher the filtration efficiency, the less undissolved impurities remain in the filtered water. On the other hand, finer cleaning usually takes more time, which affects the speed (throughput) of the filter. It should be noted that in the case of using reverse osmosis filters, the filtration is very fine, up to 0.01 microns.

The amount of water that the filter is able to pass through itself per unit of time (of course, effectively purified in the process); usually stated in liters per minute. This parameter is largely related to the type (see above): for example, in jugs, the filtration rate usually does not exceed 0.5 L per minute, while for main devices that supply entire apartments, a throughput of tens or even hundreds of liters is required.

Note that it does not always make sense to pursue a high filtration rate. After all, other things being equal, finer cleaning takes more time; accordingly, the faster the filter works, the higher the chance that the quality of such cleaning will be relatively low. And devices that purify water efficiently and quickly usually have an appropriate price. Therefore, it is worth considering the purpose of the filter and, on the basis of this, determine the balance between the filtration speed and its quality when choosing. It is also worth keeping in mind the conditions of use: for example, if you need to filter low-quality tap water for drinking, it is better to sacrifice speed in favor of efficiency.

Substances from which the filter is able to purify water. Some models may also indicate a specific degree of purification in percent for each point; the higher this indicator, the more efficiently the filter is able to cope with its functions. This list will be especially useful if you know what exactly is the most polluted water in your area — it will allow you to choose the model that is most suitable for specific conditions. In addition, in the case of softening systems (see "Type"), this data helps to determine the specific type of device — softener or iron remover.

The most common contaminants today are:

— Mechanical impurities. Particles of small size, insoluble in water and in a state of suspension. An example of such impurities is fine sand.

— Organic impurities. Impurities of various substances of organic origin — benzene, chloroethanes, chlorethylenes, etc. Many of these substances are harmful to humans. Unlike the mechanical impurities described above, "organics" refers to chemical contaminants — such substances dissolve in water, and they have to be filtered at the molecular level. This requires the use of fairly advanced filters. It is also worth mentioning that some types of organic substances — in particular, phenol, pesticides and petroleum products — stand out in separate categories, the possibility of filtering them is specifically stipulated in the specs...of the filters. This is due to their prevalence and popularity: the term "organic impurities" is not clear to everyone, but the danger of pesticides or petroleum products is well known. See below for details on individual types of organic contaminant.

— Active chlorine. Chlorination is still used in some plumbing systems as a disinfectant. As a result, water supplied to consumers often contains dissolved chlorine, which is harmful to health. Some filters with this function, in addition to chlorine, are also able to remove hydrogen sulfide and other gases dissolved in it, which affect water quality and give it an unpleasant odour. However, these possibilities should be specified separately.

— Iron. Iron is known to many as an important trace element necessary for the functioning of the body; however, a person needs very little of it, and iron impurities in drinking water only harm the body. Note that such impurities can be present in different forms; therefore, different types of filters are required to filter them. So, one of the most famous options is colloidal iron: very small undissolved particles that give the water a characteristic “rusty” colour, as well as a metallic taste and smell. This type of impurities is effectively filtered by osmotic membranes (see "Reverse osmosis"). Also, such membranes cope well with bacterial iron — it is also in the form of insoluble microscopic particles, accumulates a specific type of bacteria that lives in water pipes. But for soluble forms (ferrous hydroxide, chloride and ferrous sulfate), it is necessary to use specialized cleaning and softening systems — iron removers; see "Type" for details. Summing up, we can say that when choosing a device with this type of filtration, it is necessary to take into account the specific form of iron that you have to deal with. At the same time, water can contain several types of such impurities at the same time, which may require complex filtration.

— Ions of heavy metals. In this case, we can also talk about salts of heavy metals: ions are formed when any salts are dissolved in water. Most heavy metals — accordingly, their compounds — are toxic to humans.

— Pesticides. Various chemicals used to combat harmful microorganisms, fungi, weeds, various agricultural pests (insects, rodents), etc. Most pesticides are toxic chemicals and are toxic to humans.

— Nitrates. Salts of nitric acid, which are a common component of mineral fertilizers (saltpeter) in particular. Most of the nitrates are converted into safe compounds during use, but excess fertilizers can end up in drinking water.

— Cadmium. A metal used in particular in anti-corrosion coatings, batteries and inorganic dyes. Poisonous both by itself and in various compounds.

— Petroleum products. Oil and various substances obtained from it (gasoline, kerosene, diesel fuel, fuel oil, etc.). It is poisonous when taken orally.

— Hardness salts. Compounds that give water increased hardness are primarily calcium and magnesium salts. Water purification from such salts is carried out by purification and softening systems based on the principle of ion exchange. For more information about such devices, see "Type", here we note that if the specs of the cleaning and softening system indicate the filtration of hardness salts, then we have a classic softener, if not — an iron remover.

This list is not complete, modern filters can specialize in other types of pollution. For example, for many main models (see "Type"), filtration from sand and clay is separately claimed. In our catalog, such moments are described in the paragraph “Additional cleaning".

The highest inlet water temperature at which the filter is able to operate normally. Modern filters are conditionally divided into models for cold and hot water: the operating temperature in the first case does not exceed 40 °C, and in the second it can reach 95 °C. For more information on the importance of matching water temperature and filter characteristics, see "Purpose".

Models of replaceable cartridges for which the filter is designed. Knowing the names of models, it will be much easier for you to find a replacement for an exhausted cartridge. In addition, the options directly named by the manufacturer are fully compatible with the filter and correspond to official specifications, while there is no such guarantee for "non-native" cartridges.

Several names in this paragraph are usually indicated for filters with multi-stage filtration (see "Stages of purification") — a cartridge for each stage.