Omicron™ SFNY33XB Nylon Chromatography Syringe Filters, Non-sterile, 33mm, 0.45 Micron (Pack of 50) (HPLC Certified)

I will add to this review when I have more time. Since I see no reviews for a company/product that is evidently sooo unjustly overlooked and seemingly "outranked" by products such as whatman, etc merely due to more presence on the web, there needs to be a review/clarification that this company's products are indeed absolutely top notch. This is the only true "large" inner diameter filtration area filter. I have bought another so-called "best" Brand's 33mm filter only to find it was a lie! They must have used outer diameter as the dimension. I have used a thousand or maybe more if this exact filter before they even sold on Amazon, and in all honesty, I have never had a failure. They have a true close to 30mm filtration diameter (which means exponentially larger filtration surface area - π*r^2), so very particulate ridden (dirty) samples that will clog a 25mm filter beyond any hope of use, this filter pulls the sample through with ease! For my purposes they do need a rinse which does mean excess volume of liquid, but it gets the sample cleaned/separated as desired. Use these filters. The company is great. I will give examples later. For now, this is a truly unique product on the market. Pay the price because they are worth every cent. Sorry for possible crazy grammatical mistakes. I didn't read over this review. Buy them loyally.