Well filters play an important role in well construction. They form the heart of the garden fountain, so to speak, as they filter the water and in this way ensure that it enters your garden oasis in a clean condition. Find out what to look out for when buying well filters.
The well filter is an important investment in the well tree
Our recommendations
our recommendation
Cornat handle pump accessories, ribbed filter, slot width 0.3 mm, 1 1/4" x 100 cm / garden irrigation / PZB0354100
25.53 EUR To the product| Type | PVC filter pipe |
|---|---|
| material | plastic, brass |
| Ribbed | Yes |
| slot width | 0.3mm |
| diameter | 1 1/4 inches |
| Wall thickness | n/a |
| length | 100 cm |
The Cornat rib filter impresses in particular with its excellent price-performance ratio. According to the reviews on Amazon, the well filter is very popular. The qualitative advantages include the ribbed surface. Other important dimensions are the slot width of 0.3 millimeters and the diameter of 1 ¼ inch. The length of the plastic and brass filter tube is one meter. According to the manufacturer, it is advisable to pre-drill the soil before driving in the well filter and to mount a hammer head on the robust ribbed filter.
our recommendation
Agora-Tec 4 inch DN 100 well pipe - set (10 meters) with 8 meter solid wall pipe, end cap and 2 meter filter pipe with a (slot width: 0.75mm)
244.95 EUR To the product| Type | PVC filter pipe |
|---|---|
| material | plastic |
| Ribbed | Yes |
| slot width | 0.75mm |
| diameter | 4 inches |
| Wall thickness | 5mm |
| length | 200cm (2×100cm) |
The well pipe set from Agora-Tec(R) consists of eight solid wall pipes and two filter pipes as well as a bottom cap. Important: We only took the filter tubes into account in the characteristics in the table. All in all, the assembly of all components results in a filter length of ten meters. The filter tubes are ribbed and have a slot width of 0.75 millimeters and a wall thickness of five millimeters - with a diameter of four inches. The set is extremely popular with reviewers on amazon.de. It should be of high quality and easy to process.
our recommendation
2 inch plastic filter PVC ribbed for a pipe well_-=-_ Also in the range are various well construction set well pipes well filter auger handle pump So everything for well construction
39.69 EUR To the product| Type | PVC filter pipe |
|---|---|
| material | plastic |
| Ribbed | Yes |
| slot width | 0.3mm |
| diameter | 1 1/4 inches |
| Wall thickness | n/a |
| length | n/a |
The Brunnenandi filter tube has similar characteristics to the Cornat version. It is made of plastic and galvanized with malleable iron, which further increases stability. In addition, the fountain filter reveals a ribbed surface - just like the other models in our comparison. The fact that we "only" placed this filter tube in third place despite the best ratings on amazon.de is mainly due to the fact that only sparse information on the properties is available and the costs are higher than with our comparison winner.
Purchase Criteria
filter type
PVC filter tubes: The classic PVC-U filters are suitable for so-called loose rock layers such as gravel and coarse sand. They are used most frequently and cost significantly less than fine filter tubes.
fine filter tubes: If for any reason you are dealing with problematic soil conditions - i.e. alluvial or fine sand - you need fine filter tubes. This category includes fabric filters, fine sand filters and gravel filters. Fabric filters are the cheapest solution; specific fine sand filters with PVC pipe outer wall and HDPE jacket are more stable and resistant, which is reflected in a higher price. There are hardly any gravel adhesive filters anymore. In principle, they are normal slot filter tubes, but covered with a thick layer of filter gravel, which increases the filter effect.
ram filter: For a rammed well, you need a rammed filter that forms the top of the ram tubes. It is available with inner or outer braid. You can ram a ram filter with inner weave directly into the ground; on the other hand, when using a ram filter with an outer braid, you should first pre-drill the well hole down to the groundwater layer before driving the ram filter and its extension pipes into the ground.
material
Most well filters are made of PVC-U. This synthetic material has all the essential characteristics that are important for a fully functional and long-lasting fountain. It is weather and corrosion resistant and also pleasantly light. In general, PVC-U is characterized by excellent chemical and physical properties. Be sure to choose plasticizer-free material so as not to harm any living beings in the soil. There are also well filters made of steel. However, these are often more difficult to install because they are less flexible.
Ribbed vs smooth surface
Generally, ribbed filters are preferable. Compared to smooth filters, they have a larger filter surface. In addition, the small stones around the filter are not directly in front of the filter slots.
slot width
Which slot width is the right one depends on the soil conditions. Basically, the finer the gravel in the water-bearing layer is, the finer the slot width of the well filter should be. Depending on the diameter of the well filter pipe, the measurement starts at 0.2 to 0.3 millimeters and goes up to 2.0 millimeters and larger.
Examples of suitable slot widths: For example, with a relatively loose sand-gravel mixture, you can use conventional PVC filter pipes with a slot width of 0.5 millimeters; with slightly finer sand, the slots should only be 0.3 millimeters wide. In the case of even more delicate fine sand, fine filter tubes with slot widths of 0.2 millimeters are required.
filter section
The filter distance results from the number, the length and the diameter of the filter tubes. It can also be adapted to the ground conditions, as can the slot width. In addition, the maximum flow rate of the well pump used must be taken into account when selecting the filter section.
diameter
In terms of pipe diameter, it is advisable to use filter pipes of size DN 100 or 115. These offer high compatibility with various deep well pumps. Basically, you always have to make sure that the diameter of the filter pipes harmonizes with those of the pump and other connections. Consider both the internal threads (read the inner diameter) and the external threads over the sleeve (read the outer diameter).
Important: Also note the type of thread. A distinction is made between pipe threads, trapezoidal threads and C threads.
Wall thickness
In principle, the greater the wall thickness, the more stable the respective well pipes are. And: The deeper the well filter is to be installed, the more robust it has to be. Filter tubes with a wall thickness of a good three to four millimeters are perfectly adequate for most garden fountains. Wall thicknesses of up to around 24 millimeters are possible depending on the pipe diameter and individual requirements.
youtubefrequently asked Questions
What are well filters and what are they for?
Well filters are filter tubes. They serve to filter the water and thus clean it before it rises to the surface. The water from the aquifer reaches the well through the filter pipes. The pipes have to withstand the chemical and mechanical loads in the ground.
What should be considered with regard to the filter tube length?
It is essential to ensure that the area of the aquifer that is used for water extraction has been penetrated by the filter pipes. The upper edge of the filter pipes must remain one to three meters below the lowered water level. Otherwise there is a great danger that air from the well will be drawn into the water level fluctuation area of the depression funnel. This would lead to incrustation and clogging both on the filter pipe and in the water-bearing layer.
How do I prevent sand from entering the well filter?
In order to specifically prevent sand from getting in, you should close the well filter from below either with a bottom cap or - in the case of immediate drilling - with clay pellets.
Which manufacturers produce high-quality well filters?
The companies Erdbohrer and Lotze are among the most renowned manufacturers of well filters.
Where is the best place to buy well filters?
Well filters are available in all well-stocked hardware stores and often also in garden centers. You will also find what you are looking for in special shops for fountain accessories. You also have a good selection on Amazon. There you also benefit from a very simple ordering procedure and the uncomplicated option of returning the filter tubes if they do not meet your requirements 100 percent.