- Soak in a 1:1 bleach and water solution for 24 hours in a non-metallic container in a well ventilated area and away from children.
- Use regular 8.25% hypochlorite household bleach (non-scented, no dyes, do not use a splash-less bleach).
- Rinse well, then soak for 8 hours with a solution containing 4 tablespoons of Seachem Prime, or an equivalent dechlorinator per cup of water.
- Rinse well.
- For freshwater use, soak for 4 hours with a solution containing 2 tablespoons of buffer per cup of water (such as Seachem Discus Buffer or Seachem Neutral Regulator).
Original color and full activity should now be restored and Purigen is ready for reuse.
There are some slime coat products that may permanently foul Purigen and make the regeneration process difficult or impossible. Do not reuse if odor of bleach/chlorine is detectable. In case of doubt, soak beads in small quantity of water and test for residual chlorine with a chlorine test kit.