Frog @Ease In-Line System Kit Bundle Simplify your hot tub maintenance with the FROG @Ease In-Line System Kit Bundle, a complete water care solution designed for Marquis, Caldera, Artesian, and Hot Spring Spas up to 600 gallons. This bundle includes 1 system kit (mineral cartridge, SmartChlor cartridge, test strips, startup shock) plus 3 extra SmartChlor cartridges for extended, hassle-free operation up to 4 months. Key Features and Benefits: Combines sanitizing minerals with self-regulating SmartChlor® technology to cut chlorine use by up to 75%. Creates soft, odor-free Fresh Mineral Water® that's gentle on skin while killing bacteria two ways. In-line design installs directly into your spa's plumbing—no floating dispensers or daily dosing needed. Easy color-match test strips with "out" indicator show exactly when to replace cartridges. Bundle provides months of cartridges for consistent performance with minimal intervention. Specifications: Bundle contents: 1 system kit + 3 SmartChlor cartridges Compatibility: Marquis, Caldera, Artesian, Hot Spring Spas (up to 600 gallons) Cartridge life: Mineral 4 months; SmartChlor 3-4 weeks each Function: Low-chlorine mineral sanitization system Item reference: In-line @Ease bundle for select brands