It doesn't have a brand name, but is a 2 cylinder unit, the filters are the ones used in dental offices. It's not my area of responsibility, but I'm sure they are ordered online, possibly Amazon and say either food grade hospital grade. They're about 10" long. You put the 1.0 or 2.0 micron one first to trap larger particles and the .2m one second to get the little bugs. Choose "high flow" if there's a choice. I think the 1-2 m ones are under $10, the finer .2m ones are somewhere between $30-60 each. People who RV and sometimes hook up to questionable water sources use the .2 m ones as well to avoid getting sick. We spend 6 months each in 2 different places and thefilters are each changed twice a year in each place, so in one home maybe every 3 months - but we are not average there are 2 of us and we feed and host a lot of company. Also, if the flow slows down we change them.