The BRS 2 Part Doser is a reliable and cost-effective solution for automating the dosing of calcium and alkalinity in saltwater aquariums. This doser uses a peristaltic design that ensures no back-siphoning, providing extremely accurate flow rates at up to 1.1 mL per minute. The pump is designed for intermittent use with on/off cycles recommended under a few hours to extend its lifespan. It's ideal for both novice and experienced reef hobbyists looking to maintain stable water parameters without constant manual adjustments. With dimensions of 4" x 3.25" x 4.5", the BRS 2 Part Doser fits neatly into most aquarium setups, and it can be easily integrated with controllers like Apex for precise automation. The pump is backed by a 24-month warranty from Bulk Reef Supply.