Directions/Specifications
We find that crushed coral inside the aquarium may need to be replaced every 1-2 years depending on how low the pH of the tap water is.
If using crushed coral in a filter, it will dissolve faster. This means you'll usually use smaller amounts but replace it more frequently. Replacing crushed coral after 1-3 months is most common. For easy removal, use crushed coral in an Aquarium Co-op Filter Media Bag.