A: According to the Culligan ads, the S-1A cartridge will fit your HF-150 filter. I have a HF-360 filter, same thing but has a transparent case instead of blue. Only issue I can see with the S-1A filter cartridges is that they will let larger sediment pieces through (20 micron) than the P5 cartridge (5 micron). Since I had my well chemically cleaned 2 years ago prior to disinfection the stainless steel inlet screen at the bottom of the deep well is letting larger particles in, but the filter catches them when they reach the house. I change P5 filters every 2 months now, used to be every 3. Answer provided by:  Mark (11/3/2014)

A: According to the Culligan ads, the S-1A cartridge will fit your HF-150 filter. I have a HF-360 filter, same thing but has a transparent case instead of blue. Only issue I can see with the S-1A filter cartridges is that they will let larger sediment pieces through (20 micron) than the P5 cartridge (5 micron). Since I had my well chemically cleaned 2 years ago prior to disinfection the stainless steel inlet screen at the bottom of the deep well is letting larger particles in, but the filter catches them when they reach the house. I change P5 filters every 2 months now, used to be every 3. Answer provided by:  Mark A (11/3/2014)