VersaChlor W9501152 Tab Stacking Cartridge System II. The VersaChlor system works by diverting a side stream of water through the unit and over a sieve plate so only the tablets on the bottom come in contact with water. This system is based on globally proven technology and is designed specifically for hotel, motel, health club, apartment complex and condominium-sized pools and spas. It’s an extremely effective system featuring few moving parts and no small openings that easily clog, freeing operators from constant maintenance and limiting cleanings to only once per year in most cases.