Filtration Steps in a reverse osmosis device: different filters and accessories

The process of best reverse osmosis system in itself is very cheap. But as can read already above could be reverse osmosis usually preceded and succeeded by one or more other filters. Often it comes to settling by sediment filters.

1. Sediment Filter osmosis device

The sediment filter is one of the two pre-filters which are in principle at standard osmosis equipment. This screen is filled with a layer of filter sand, filter glass, ceramic and plastic filter granules; here, the water drops from top to bottom therethrough. The sediment filter therefore thus removes particles from the water before they reach the osmosis membrane and is crucial for optimal quality, performance and service life of the reverse osmosis membrane. This involves the setting of relatively coarse impurities such as lime scale and rust.

With natural multimedia sediment filtration drops of water by a plurality of sediment layers: layers of sand, gravel layers, layers of clay, silt layers, the clay layers, gravel layers, rocks, etc. The sediment filter in an osmosis device for home use the other hand, usually consists of a sand filter: a filter housing filled with polypropylene fibers (type glass fiber or glass screen) with a diameter of 1 micron or 5.

The sediment filter is always before the osmosis membrane. Rather take no in-line copy, but a high-capacity 1 or 5-micron filter which is to be placed in a filter housing. A sediment cartridge c.q. The filter cartridge should be replaced at least once a year to protect the membrane best.

By far the most osmosis units are equipped with a sediment filter to protect the osmosis membrane.

2. Osmosis Membrane: the heart of the osmosis system

A semi-permeable ‘osmosis membrane “is also called” osmosis membrane “or” osmosis bladder. Cellophane, parchment paper, pig bladder and walls of living cells are some examples of membranes which are permeable by nature, and thus permeable to water and other small molecules exceptional. Examples of substances from which modern osmosis membranes are made are, among other things composite polyamide and cellulose (tri) acetate. For the time being, there are five different types of RO membranes on the market, namely:

  • Cellulose acetate (CA): the original RO-membrane
  • Mix by cellulose acetate and cellulose triacetate (CA / CTA Blend)
  • 100% cellulose triacetate (CTA Pure)
  • Thin Film Composite Polyamide (TFCPA) (source)
  • Specializing Bacteria and Viruses RO membrane

The RO module (layer + little fiber) forms the heart of a modern osmosis system. The ideal osmosis membrane, unfortunately, does not yet exist, but it is working hard on the way here! For the time being any membrane has a maximum temperature that should never be exceeded. It is also applicable to still: the higher the water temperature, the more membrane fouling, and the smaller the rate of return.

Tip: With cross-flow techniques ( ‘cross-flow’, ‘backwash’, ‘auto-flush and others) in modern osmosis device, the membrane may itself continuously rinse or’ flush ‘, so do not plug the membrane pores and membrane much longer life.

3. Activated Carbon Filter osmosis device

Because TFC membranes of modern osmosis devices are sensitive to chlorine, almost every osmosis filter also features an activated carbon filter. This charcoal is logical before the TFC membrane and takes beside chlorine much more organic, synthetic and chemical impurities from the water. Always observe osmosis device with the filter for carbon filter; carbon pattern c.q. Carbon cartridge what’s inside, preferably a block carbon filter. Or else a GAC filter, i.e., GAK / UDF.

Often there is also at the end of the ride even placed a small carbon filter to adsorb themselves free materials absent from the osmosis device.

4. Ionization filters in osmosis device

State of the art osmosis devices can also be provided with an additional desalination device. In such a case, after reverse osmosis will also have another form of deionization and membrane filtration takes place, usually with the aid of ionized ion exchange resins.

Go preferably for a 10-inch deïonisatiefilter; these may, in the event of saturation easily be provided with new ion exchange resin (resin beads). The exact lifespan of this type of filters is highly dependent on the quality of the feed water. The saturated resin must be replaced in time anyway; The saturation can be easily measured if the device is equipped with a TDS meter (v.w.b. solutes or EC-meter (v.w.b. electrical conductivity).

A DI filter has a very broad operation v.w.b. mineral salts / electrolytes / ions. Is there not a full spectrum DI filter is present, can -depending on the exact water composition- these narrow range of specialized ion filters are desirable:

10-inch refillable nitrate filter with anti-nitrate resin (after the RO membrane and before any silica filter).
10-inch rechargeable silica filter with resins against silicates and phosphates (after the RO membrane and after any nitrate filter)

Because osmosis device not only works with a semi-permeable membrane but also want to catch up with all sorts of filtration and purification techniques, such a device is considerably to the price, at least, if you have an actual copy in the house

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