Balance Blocks replenish and add calcium and a total of 71 vital trace elements to saltwater & reef aquariums systems, while it helps to stabilize the pH at an ocean stable 8.2-8.3 

Balance Blocks contain calcium, trace and ultra trace minerals needed for all forms of aquatic life for improved development, health and vitality. Formulated using absorbable ionic liquid trace minerals.

Balance Blocks are compatible with either synthetic marine and/or natural seawater. they are compatible with all conventional filtering materials such as sand, gravel, crushed coral, activated carbon, biomedia, polyester fiber materials and foam material.

Dosage:

One Balance Block per 20 gallons of aquarium wateris adequate, though one block may be used safely in tanks as small as 10 gallons. Placeblock in an area of good water cirulation but not in directpath of waterpump outlet. When a block has dissolved, simply add another. Blocks will dissolve as needed. With Balance Blocks the calcium levels are usually selfregulating but continue to monitor calcium levels in calcium critical tanks.