The Pentek PBH-410-1 Bag Filter Housing is the system that you have. This PBH-410-1 Filter housing requires a bag filter that is 4" x 8 5/8". A full selection of these filters can be found here:
http://www.waterfilters.net/Filters/...ilter-Bags.htm
There are two different 5 micron bag filters that are the correct size for your PBH-410-1 Bag Filter Housing:
The Pentek PB-410-5 Bag Water Filter:
http://www.waterfilters.net/Pentek-B...ne_p_0-34.html
And the Pentek PBH-410-5 Bag Water Filter:
http://www.waterfilters.net/BPH-410-...g_p_0-561.html
This 5 Micron Pentek bag filter is a high efficiency filter. It has been rated at 98% efficient.