Ugh, I just noticed this as well. I paid like $350 for these 3 years ago and am not happy about current prices. Between that and the System 3 egg being so annoying to open up, I kind of want to get quotes for installing a Pentair C&C system. I'm so sad that Leslie's bought Pool Supply WorldSta Rite 3 replacement cartridges are well north of $500. So be aware of that.
Cartridge Replacements For Sta-Rite® System 3® S7M120® by Optimum Pool Technologies
This replacement filter cartridge kit is designed for the Sta-Rite® System 3® S7M120® Modular Media Filter. The S7M120® Filter holds one smaller inner cartridge (100 sqft) and one larger outer cartridge (200 sqft). This Optimum Pool Technologies replacement cartridge kit includes one small and...poolguysupply.com
