Comparison Aquaphor Crystal Eco H vs Aquaphor Crystal Quadro

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 presence of a capillary membrane in the filter design.

The capillary membrane is a filter element consisting of numerous thin (up to a millimetre in diameter) synthetic tubes — capillaries — with villi on the inner surface. Water passes through such tubes freely, and foreign contaminants are retained. According to the principle of operation, the capillary membrane is a mechanical filter, but unlike conventional elements of this type (see "Pollutants clipping"), it is capable of retaining much smaller particles — up to hundredths of a micron inclusive. This is enough to remove from the water not only insoluble impurities that were missed in the previous stages, but also most bacteria. Therefore, capillary membranes are classified as fine filters and are often used at the last stage of the process.

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.