A brewery customer was looking for a more stable and cost-effective filtration solution for their beer production process. The customer’s existing filtration system could remove most visible particles, but the filtration performance was not always stable during continuous production. In some batches, the beer still showed slight turbidity, fine suspended particles, or faster filter blockage than expected.

For confidentiality reasons, the customer name, company name, and detailed production information are not disclosed.

The customer’s main requirements were clear: improve beer clarity, reduce particle contamination, keep stable flow during production, and control filter replacement cost. At the same time, the filtration solution should not affect the beer’s taste, color, or normal production process.

Before contacting Pullner, the customer mainly used a single-stage filtration method. One type of filter cartridge was installed near the final process point. Although this filter could work under normal conditions, it had several limitations.

First, the inlet liquid contained different types of impurities, including yeast residue, suspended solids, fine particles, and possible process residues from upstream treatment. A single fine filter had to capture both large and small particles at the same time, which caused faster blockage.

Second, the customer had tried several filter cartridges from different suppliers, but the results were not consistent. Some filters had acceptable filtration performance but higher pressure drop. Some had good flow rate but limited particle retention. Others were too costly for regular replacement.

Third, the customer needed a practical filtration plan that could be used in daily production, not only a high-cost final filter solution.

After reviewing the customer’s working condition, Pullner analyzed the filtration process from several points: beer flow rate, operating pressure, filtration position, current filter size, replacement cycle, particle load, and the customer’s clarity requirement.

Pullner found that the key problem was not only the filter micron rating, but also the filtration arrangement. The customer was using the final filter to handle too much impurity load. This made the system unstable and increased filter consumption.

For brewery filtration, different particles should be removed step by step. Larger particles and yeast residues should be reduced at the first stage, while finer particles should be removed at the final stage. This staged filtration method can protect the final filter and make the whole system more stable.

Pullner suggested changing the original single-stage filtration into a staged filtration design.

At the first stage, Pullner recommended a pre-filtration cartridge with a larger micron rating. Its purpose was to remove coarse suspended solids, yeast residue, and larger particles before the beer entered the final filtration stage. This helped reduce the particle load on the downstream filter.

At the second stage, Pullner tested different pleated filter cartridge materials, including PP and PES filter media, according to the customer’s beer properties and process requirements. The goal was to compare flow rate, pressure drop, particle retention, and filtration stability under actual operating conditions.

After testing, Pullner selected a more suitable final pleated filter cartridge for the customer’s process. The selected cartridge provided better fine particle removal, lower pressure rise during operation, and more stable flow performance. Compared with the original filter arrangement, the new staged solution allowed each filter to do its own job: the pre-filter handled coarse impurities, and the final filter focused on improving beer clarity.

After the Pullner filter cartridges were installed and tested in the customer’s brewery filtration system, the customer confirmed that the beer clarity was improved and the filtration process became more stable.

The pressure increase during operation was slower than before, which meant the filter cartridges were not blocked as quickly. The final filter replacement cycle became more predictable, and the customer reduced unnecessary filter consumption caused by early blockage.

More importantly, the filtered beer met the customer’s production requirements. The solution helped improve visual clarity while keeping the normal taste and production process unchanged.

This case shows that in beer and beverage filtration, selecting a filter cartridge only by micron rating is not enough. A good filtration solution should consider the complete process, including particle type, flow rate, filter material, pressure drop, replacement frequency, and production cost.

Staged filtration is often more effective than using only one fine filter. By removing larger particles first and then using a suitable final filter, breweries can improve filtration stability, protect downstream equipment, reduce blockage, and lower long-term operating costs.

Pullner provides different filter cartridge solutions for beer, beverage, food processing, and industrial liquid filtration applications. Available materials include PP, PES, PTFE, Nylon, PVDF, and glass fiber, with different micron ratings, lengths, and connection types.

For customers facing beer turbidity, unstable filtration, high pressure drop, short filter lifetime, or high replacement cost, Pullner can help analyze the working condition and recommend a suitable staged filtration solution.

To learn more about Pullner filter cartridges and beverage filtration solutions, please visit www.pullnerfilter.com.