Choosing a filter grade is rarely a calculation. Medium, particles, flow, temperature and the installation situation all pull on each other, and micron rating selection on its own will not get you there. This page is for filter selection advice on standard products: the chat usually settles it, and as soon as dimensions, photos or files are involved, the form is the faster route.
Not every question needs a long enquiry. If you only want to know whether an existing size is still available, the chat takes two minutes. If you have to describe a plant, the form is the better place.
Open the chat bubble at the bottom right and say what the job is: dewatering sludge, pre-filtering rainwater, choosing a filter medium, or replacing a filter bag that has to fit an existing plant. We will tell you which details are still missing and whether there is already a standard product for it.
In the form you can put installation dimensions, medium, temperature, chemistry, quantity and any files together in one go. A photo of the old filter often says more than three paragraphs of description.
Describe the medium and the solid as concretely as you can. Sludge, rainwater, electrolyte, coolant, well water and process water are different jobs even when the filter shape is the same.
A known particle size helps but is not essential. A photo, a sample, or a description of what is getting through now often tells us more than a figure from a data sheet.
Installation space, fixing, flow, temperature, chemistry and quantity decide in the end whether a standard product covers it or it becomes a special size.
Filter media selection follows the process, not a preference. Polypropylene, polyester and polyethylene differ in chemical resistance and in temperature limit, and a fabric and a nonwoven of the same nominal grade behave differently in the same tank. What we need from you is temperature, chemistry, mechanical load and the result the process actually requires.
For nonwoven roll media there is a filter media selection guide that works through fibre, area weight and thickness in order. For everything else, tell us the process and we will do the comparison.
One point that saves a lot of correspondence: the micron figure describes the medium, not the outcome of your filtration. After a short running time the filter cake takes over a growing share of the separation, and the medium mostly decides how quickly that cake forms and how easily it releases again.
Enter what you have. Missing values are no reason to abandon the enquiry, we will ask for the rest.
for companies, municipalities, trade and private use
suitable for standard products and for filters made to measure
photos, sketches and existing product data help with the assessment
If this is not about a product but about a running process, falling service life or an on-site visit, industrial filtration consulting is the right route.
If the form does not load, call us on +49 (0) 5203 8828-0.
Answers on micron rating, filter media, shape and the right route to advice. For a concrete recommendation we always look at the actual application.
There is no rule that holds for every application. The grade has to suit the particles and the flow you need. A lower micron rating holds back finer material but blinds off sooner. On top of that, the filter cake starts contributing to the separation after a short running time. So we look at particles, medium, filter area and the required result together instead of quoting a number.
We need installation dimensions, fixing, fill volume, flow and medium. With existing plant, photos, name plates or the dimensions of the filter used so far will get us there. For the sizing question across our range there is a guide that compares volume, working load and build height.
That follows from temperature, chemistry, mechanical load and the separation result you need. Polypropylene, polyester and polyethylene have different resistances and different temperature limits. Filter media selection is therefore about the process rather than about the material on its own; without process details a blanket release would not be sound.
The terms are not used consistently. What matters is the shape and the application: in closed filter housings people tend to say filter bag or pouch, in open dewatering and high volume applications filter sack.
In most cases yes. Many product questions can be settled in the chat or by email. With new or complex industrial processes a call or an on-site check may be worth it.
Yes. Send us the drawing or the old part and we will check whether we can reproduce it. For purely textile contour parts the route usually runs through laser cutting; for sewn filter elements it runs through technical consulting.
If dimensions, shape or material differ from the standard range, we look at a custom textile version. There are two routes to it, and which one is right depends on what is already decided.
If the contour is fixed and it is a textile blank, laser cutting is the direct route. If the contour is not fixed because the filtration problem has to be solved first, we start with technical consulting.
drawing, sketch or an existing sample
material designation or data sheet
dimensions and quantity
notes on temperature, chemistry and load
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