10PCS PVDF Syringe Filter 0.22?m Sterile Hydrophilic Filtration Lab Filters 25mm Membrane Diameter Individually Packed...

I have a home-made photometer that I use to measure beer color. Its very important that the beer be free of any suspended particles (like yeast) to make these measurements or else theres light blocking and scattering effects that can affect the result. To eliminate these errors, its important that the beer be clear of any suspended matter and so it should be filtered beforehand if necessary. Filters with a 0.2m pore size should be more than adequate to perform this filtration. Ive used 13mm x 0.2m filters in the past to perform this filtration and, while they were effective, the filters got blocked after passage of only 2 or 3mL of beer. Im hoping that these 33mm filters from Cobetter will do a better job. Beer was loaded into a 3mL plastic syringe and one of these filters was attached to its Luer-lock outlet. The plunger was depressed, and the beer was fed into a 2-mL cuvette. I had no problems with blockage that I had experienced with the smaller filters. The photos show the difference in clarity between filtered and unfiltered of this particular beer (Berliner Weisse Beer). The photometer measured the color (in SRM units) for the unfiltered beer as 4.71 and for the filtered beer as 2.35, so removing the cloudiness made a big difference to the measurement. These filters are nicely packaged in sealed individual bubble-packs. They are sterile. I suppose all this comes at a price and perhaps the quality of this product is too good for my purposes. I dont care about contamination or sterility I just want to measure beer color. Having said that, the price is not crazy and $13 for 10 filters is not prohibitive. These are good quality filters at a reasonable price but perhaps a bit too good for my needs.

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