NEW ANTIMICROBIAL FILTERS ARE HERE! Silver is infused into the filtration fabric during the manufacturing process and becomes part of the molecular structure. The silver technology works continuously to provide an added level of defense that keeps your filter cleaner between cleanings. Antimicrobial protection is limited to the filter and is not designed to replace normal water treatment chemicals. Also replaces the following filters: UNICEL 6CH-47--FILBUR FC-0315--Pleatco PTL47W-P4 Also replaces the following filters: Aber Hot Tub Advanced Spa Design After Hours Spas Blue Ridge Crystal Water Spas Dolphin Spas Echo Series Gatsby Hydro Spa La Spas Pacific Spas Premium Leisure Alternative filter numbers: --03FIL1500 --17-175-1004 --090164470009 --373043 --090164470030 --PTL 47W --PTL47W W/ PAD AD --PTL47W W/ PAD --PTL47W-P --PTL47W-P-M