TAP Alkaline Increase Aquarium p H. A safe, effective & long lasting way to raise the p H levels of any aquatic system. Use for those fish that prefer hard alkaline water e.g. Malawi Cichlids, & use regularly to maintain ideal conditions for alkaline loving fish. Use to keep marine aquariums at p H 8.3. A true Cationic/ Anionic buffer system. Treats 450 Litres