Bag filters are usually used in situations requiring high flow rates, but they can be used in a variety of situations. Regular polypropylene bags are only about 60% efficient at removing the particle size they are designed for, but Nylon bags are better at 80%, and there is a high efficiency polypropylene bag that reaches 98% efficiency. Depending on your situation you will want to choose accordingly. It is very common to have 2 or 3 housings in series with successively smaller micron filters in each housing to do a really good job of filtering. If you were to use just one 1 micron bag, it would clog very rapidly, because it's capturing every size particle, but if you had a 50 micron followed by a 10 micron, followed by a 1 micron, each filter is going to live much longer because it's only filtering a very narrow range of particle size. This is the best way to set up a system.
Here is a link to our bag housings page, and if you scroll down you will find the filter bags also.
Bag Filters and Bag Vessel Assembly Housings for Filter Bags.
Thank you,
WaterFilters.NET