Marine/RV iron filter and softener combo uses portable 2

https://www.softprowatersystems.com/pages/choosing-iron-filter-size-diy

Marine/RV iron filter and softener combo uses portable 2.5x10 cartridges, polyphosphate, and carbon block; quick-disconnect hose fittings, brass Y-strainer, and onboard TDS meter optimize campground well water for appliances.