Oxygen Block 20g

The Serenity slow-release oxygen block
releases oxygen and also keeps your pH stable.

Oxygen Block:
The active
oxygen block will dissolve slowly in water and release ingredients that will
help maintain a healthy environment for your fish.

As the block dissolves it will
replenish the oxygen supply.

Replace the block with a new
one when it has almost dissolved.

This product will also help stabilise pH.