APEX RF-7010 Replacement Shower Filter Cartridge Easy DIY install. No plumbing required. Fits APEX shower filters. Avoid dry skin, flaky scalp, dandruff, and fading colored hair. As a result enjoy Healthier, Softer Skin and Hair. Strong Fluoride & Chlorine removal with 17 ounces of KDF-55 along with Activated Alumina. Each cartridge lasts between 12 to 18 months.