Daro Weekend Blocks = 5 blocks

Going away for a few days? Animal kingdom Pet store has your fish sorted.

The Daro Weekend fish block dissolves slowly, neutralising the aquarium water as well as releasing food particles for your fish to eat off of while you are away.
Each block lasts for approximately 3-4 days for an average size fish tank with small to medium sizes fish. For larger fish or a larger amount of fish, add 2 or 3 blocks.

When you come back, take out any left over block and do a slight water change.