Pure USP-Grade Calcium Hydroxide powder used to prepare kalkwasser solutions for marine aquarium system. Commonly used to maintain calcium and alkalinity and increase pH levels. Highly potent and recommended to be used in kalkwasser drippers or dosers. Economical way of dosing your reef tank. High purity USP grade from UK.
Note: Must not be added directly in large amounts. Add to reach ideal water parameter only.