Experts | Dictionary

Tips about water filters


Why should I change my water filters after 6 months?

Since bacteria can also grow uninhibited in drinking water, the formation of a biofilm on the filter cartridges must be avoided!

To avoid the growth of bacteria, the filter cartridges should be changed every 6 months, especially if they are not used often!

DIN 1988 Technical Rules for Drinking Water Installations (TRWI)I)

DIN 1988, Part VIII requires the filter to be changed after 6 months! For hygiene reasons, the water filter cartridge must be replaced at least every 6 months. The reason for this is that bacteria could build up in front of the water filter over time. To prevent this, a change every 6 months is mandatory.



Insert the O-ring / seal on the filter housing correctly!

When screwing on the filter housing, please be careful not to squeeze the seal!
We recommend LUBRIKIT as a lubricant for filter housings for installation and maintenance.


1 - Remove the dosing ampoule from the package and break off the tip along the perforated line.

2 - Apply the lubricant to the O-ring.

3 - Distribute the lubricant, e.g. with a small brush, over the entire surface of the O-ring. Ensures the absolute tightness of filter housings.

How can I test my water quality quickly and easily?

When testing the water, it depends on what the water filter is needed for. In most cases, the water filter is used in the drinking water network; the waterworks meet most of the requirements of the Drinking Water Ordinance (TVO). However, it still happens that contaminated or even harmful drinking water comes out of the domestic tap. In these cases or in the case of a water supply
From a well or unknown waters, an analysis of the water quality provides an initial assessment.

A water filter recommendation can only be made if we know all the parameters of your water. We would be happy to help you if you would like to have your drinking water tested in a laboratory for chemical-physical water analysis and microbiological water testing.

Our affiliated laboratory offers you a drinking water analysis for coliform germs, Escherichia coli, enterococci, drug residues, aluminum, arsenic, bacteria, lead, bacteria, hormones, fluorine, fluoride, fungicides, Giardia, Legionella, microorganisms, Pseudomonas, pesticides, iron, manganese, Salts, sediments, heavy metals, viruses or just for evaluating the overall hardness of the water.


Which drinking water analyzes can I order??

Our test sets are suitable for preliminary drinking water analysis of tap water, well water, etc. You can order the following water tests in the shop:


Legionella testing: our popular drinking water analysis for Legionella.

Microbiology: Drinking water analysis for so-called hygiene indicators (intestinal germs).

Lead: Test for the heavy metal lead in drinking water.

Heavy metals: Water testing for 15 different heavy metals.

Well water analysis: examination for iron, manganese, nitrate, germs, etc.


Assembly of water filter housings

Water filter housings should only be installed in rooms where the temperature does not fall below 2 C. If there is frost, the water filter housing can be damaged..

Clear filter cups should not be installed in areas exposed to direct sunlight to prevent possible bacterial growth on the filter cartridges.

When installing, leave at least 10 cm of free space under the filter housing to make it easier to replace the filter cartridges.

What is water hardness?

The term "hard water" means that water contains more minerals, especially calcium and magnesium. In other words, when water contains significant amounts of magnesium and calcium, it is said to be "hard." Water hardness increases along with an increase in the concentration of dissolved calcium and magnesium in water.

Water hardness dH degree German hardness::

Hardness range "soft" less than 1.5 millimoles of calcium carbonate per liter (corresponds to 8.4 dH))

Hardness range "medium" 1.5 to 2.5 millimoles of calcium carbonate per liter (corresponds to 8.4 to 14 dH))

Hardness range "hard" more than 2.5 millimoles of calcium carbonate per liter (corresponds to more than 14 dH))

How can I remove limescale from drinking water?

1. Water filter cartridges with resin can exchange the calcium cations that are dissolved in normal tap water for sodium cations that are bound in the resin. This is only possible at a low flow rate and the resin in the filter cartridges are exhausted after a certain amount of water has been treated and must be replaced.

2. With a reverse osmosis system you get pure water without minerals. The reverse osmosis system removes all soluble and dissolved minerals with a very fine membrane using a pressure process using a booster pump.

3. A soft water system exchanges the lime [Ca+] for sodium [Na+]. You get lime-free and soft water, but the sodium content in the water increases. The advantage of a soft water system with automatic backwashing is that it offers permanent water softening even at higher flow rates and for several years. The filter medium is regenerated as needed using a salt solution. All you have to do is add pure salt.

Function of soft water systems water softener water softening systems as anti-limescale filters.

Wherever hard water is heated, limescale flocculates, such as in hot water boilers, instantaneous water heaters, washing machines and dishwashers. Coffee machines as well as shower cubicles and bathtubs are particularly susceptible to limescale. Limescale not only shortens the lifespan of the devices, but also causes higher energy consumption.

This process is carried out electronically controlled in the soft water system.

Soft water systems are only filled with ion exchange resin. The calcium and magnesium ions dissolved in the water are bound and exchanged for sodium ions. During the electronically controlled, fully automatic regeneration, the ion exchange resin is cleaned with a light saline solution made from salt tablets so that the calcium and magnesium ions are restored
dissolve and be discharged into the wastewater during the regeneration process. To ensure that regeneration salt water cannot get into your house pipe system, the regeneration and drinking water circuits are completely separate from each other.

The advantages at a glance:

· Gently soft, lime-free water in the shower and in the bathroom

· Noticeably gentle on the skin

· Smooth, shiny hair

· Soft laundry without the addition of fabric softener/softner

· Shiny glasses and shiny dishes

· Protection against limescale deposits on fittings, tiles and in pipes

· Increased lifespan of household appliances

· Up to 50% less consumption of detergent, fabric softener/softner

· Less energy and heating costs - active environmental protection

Iron in the water?

An iron filter reduces the iron concentration, hydrogen sulfide content, metallic taste and bad smell of the water. An iron water filter is used to remove iron and manganese content from the water. These contaminants can be found in some water supply systems and can cause various problems such as discoloration of the water, deposits in pipes and appliances, and an unpleasant taste or odor in the water. The direct consequence of too high an iron content in the water is the formation of rusty edges on sanitary facilities (bathtubs, sinks).

The FE² dissolved in the water is converted into FE³ and removed from the water. The iron filter uses hydrogen sulfide in which Fe² is oxidized to Fe³.

If flow rates and water consumption are high, we recommend using a de-iron removal system with automatic backwashing. The filter medium with high and rapid oxidation capacity ensures effective and efficient removal of iron and manganese for several years. No refilling of regeneration agents is necessary.

Water with bad smell?

The smell of chlorine in water caused by excessive amounts of chlorine and its derivatives can be neutralized using activated carbon. Either activated carbon granules or an activated carbon block can be used. The activated carbon granules are particularly suitable for heavy contamination due to their extremely large filter surface. A carbon block made from pressed activated carbon also offers a nominal filtration of, for example, 10 mcr, meaning that all insoluble sediments up to a size of 10 µm are filtered.


What can I use a table-top water filter for??

What are the advantages of a table-top drinking water filter:

- Can be retrofitted anywhere without the need for craftsmen by installing it yourself

- Easy connection to existing taps

- easy switching between normal and filtered water

- Take with you on vacation or to a holiday home

- very easy and quick water filter change

What are the disadvantages of a table-top drinking water filter?

- doesn't look so nice in the kitchen

- gets in the way of the kitchen worktop or sink

What is the pH factor and what is the appropriate value?

The pH scale ranges from 0 to 14, with a solution with a pH between 0 and 7 being acidic and a solution between 7 and 14 being alkaline. A pH value of 7 is neutral.

The pH factor indicates the acidity of the aqueous solutions. The correct pH of water should be between 6.5 and 9.5 according to acceptable standards.

How does a reverse osmosis system work??

In the reverse osmosis system, known as RO system or osmosis system, the contaminated water is pressed through a reverse osmosis membrane using a pressure booster pump. The water molecules are separated from the pollutants and impurities.

The very fine pores of the membrane have a diameter of less than 0.0001 microns and therefore only allow the smallest molecules to pass through the membrane.

The pollutants and impurities are discharged into the wastewater, resulting in the purest drinking water that is low in minerals and free of pollutants (permeate).

The best osmosis systems are the direct flow tankless reverse osmosis systems, which do not require an additional tank due to a high-performance membrane. The permeate is available immediately from the tap and does not have to be produced and stored over a long period of time. In addition, the risk of germs is reduced by omitting a tank.

The quality of the membrane is crucial, the different manufacturing processes of the membrane determine the quality of the water and the taste.

Function of UV water filter and UV-C water disinfection system

With UV disinfection systems, water flowing past is continuously irradiated with a dose of UV light. The disinfectant effect prevents the spread of 99.99% of all germs found in drinking water. The high-energy UV-C radiation destroys all microorganisms such as algae, bacteria, viruses and microorganisms.

A UV water disinfection system offers safe disinfection without the addition of chemicals and is very gentle on people and the environment.

Why do I need a bacteria and virus water filter??

Bacteria and viruses in drinking water or well water can lead to a foul taste or cause health problems. Since bacteria typically have a size between 0.6 and 1.2 µm, we recommend a PCA 0.3 mcr bacterial filter with a pore size of 0.3 µm to safely remove all bacteria and many viruses.

Drinking water filters against bacteria are also often installed to protect against Legionella.

Good water filters can, among other things, remove bacteria, viruses or E. coli and legionella from drinking water!

Legionella can cause, among other things, life-threatening legionellosis, which can develop into severe pneumonia.

Drug residues and hormones?

Drug residues have been detected in drinking water for years through scientific studies. Medications such as antibiotics and hormones such as the contraceptive pill are among the most commonly found active ingredients in drinking water.

The CA-SE 10 HF-U BX 0.02 mcr - Ultra Filtration cartridge removes fine sediments and all bacteria such as E. coli, Salmonella, Vibrio cholerae, Legionella, Pseudomonas and protozoa (Giardia, Crysptosporidium).

What is a rainwater filter and how can I use it??

A rainwater filter is used for rainwater purification. The first effective coarse filter is generally referred to as the rainwater filter in a cistern.

It is primarily used to protect against the intrusion of small animals, leaves and plant parts. Downstream filter units ensure finer post-filtration.

The rainwater filter can also be placed on the drainage paths to obtain clean irrigation water.

Why do I need a backwash filter??

With the often long route from the waterworks to the house connection, there is a high probability that foreign components such as sand, rust or suspended particles will contaminate the water. This reduces the life expectancy of these household appliances such as pumps, washing machines, dishwashers, coffee machines, kettles, etc.

It is better to insert a backwash water filter. To protect your devices, use a pre-filter or device protection water filter.