Factory replacement Hot Spring filter cartridge for the 1980-1985 Hot Spring Classic which has two of these filters hanging from a tee in the filter compartment. The pre-1990 Home Spa/Prodigy, Jetsetter & Personal spa will have one of these filters behind a large grill inside the body of the spa. This filter should be sprayed off with a garden hose pressure nozzle once a month and then chemically cleaned with a filter degreaser 3-4 times a year. The typical life span of this filter is three years.
Note: 5120 stamped on the top of the filter