Need a reliable and simple way to filter your lab liquids? This pack of 12 CELLTREAT bottle top filters could be just what you're looking for. They're super easy to use - just screw one onto a standard GL 45 threaded glass vacuum bottle (you know, the ones you probably already have). The whole filter unit is made from a single piece of virgin polypropylene, which is great because it has way better chemical resistance than old-school polystyrene. The membrane inside is a hydrophilic nylon one with a 0.45 micron pore size - perfect for filtering buffers, media, sera, or for food and beverage testing. The nylon is cool because it's compatible with a bunch of stuff like esters, bases, and alcohols, and you don't even have to pre-wet it. The 90mm diameter is a nice size; it helps things filter faster and clogs less. You can use it within a temperature range from 4°C all the way up to 37°C. Just keep the pressure around 7.4 psi for best results (max is 9.8 psi). They're non-sterile, so perfect for general lab prep work. Every case has a lot number printed on it for full traceability. A solid, no-fuss workhorse for your bench.