Seachem Purigen (100 mL)
A rechargeable synthetic resin that polishes water to a sparkle and pulls out organic waste before it becomes nitrate. Bleach-regenerate it and reuse — not a single-use carbon.
- +Fine polishing — a synthetic resin that removes organic waste and yellow tint for crystal-clear water
- +Rechargeable — soak in dilute bleach to regenerate and reuse many times, so it lasts years
- +Controls organics before they break down into nitrate, easing the load between water changes
- +Comes with a mesh bag included and fits most filters — just lay the bag in the flow
- −The bleach recharge is a careful, multi-rinse process — skip a step and you risk residue
- −Exhausts faster in a dirty tank; it darkens as it loads and needs recharging
This is Seachem Purigen, a rechargeable synthetic resin that polishes water to a sparkle and removes organic waste before it breaks down into nitrate. It comes in a mesh bag, treats about 100 gallons per 100 mL, and is regenerated with dilute bleach rather than thrown away.
- Polishing water to crystal clarity and removing yellow tint
- Reducing organic load between water changes
- Keepers willing to do the bleach recharge to reuse it
- Anyone unwilling to do a careful bleach regeneration
- Biological filtration, which needs bio media
- Removing medication, where activated carbon is the usual choice
We separate what the maker claims from what independent sources confirm, what owners report, and where we are drawing an inference. We do not bench-test products.
- Synthetic resin that removes organics and yellow tint
- Rechargeable by soaking in dilute bleach, many cycles
- Comes with a mesh bag; treats about 100 gallons per 100 mL
- It controls organics before they become nitrate
- It darkens as it loads and needs recharging
- Very highly rated; the bleach recharge is a careful, multi-rinse process
- The water-polishing champion, and rechargeable so it lasts years. The catch is the bleach regeneration, which must be done carefully with a good dechlorinator rinse
Lasts years because you regenerate it rather than replace it. The recharge uses household bleach and several dechlorinated rinses; skip a step and you risk residue, so follow the instructions exactly. It exhausts faster in a dirty tank.
- An incomplete bleach rinse leaving residue that harms fish
- Regenerating too rarely, so it stays exhausted
- Expecting it to do biological filtration, which it does not
We do not bench-test this; the assessment synthesises the manufacturer's stated specification and aggregated owner feedback. We give gear and method guidance only. For a fish's specific health or diet needs, consult a veterinarian or an established authority.
Soak the exhausted resin in dilute household bleach, then rinse thoroughly and soak in heavily dechlorinated water before returning it. Follow Seachem's steps exactly to avoid residue.
It polishes water and removes organics like carbon but is rechargeable and does not remove tannins or medication as aggressively; many keepers run both.
Years, because you regenerate it. It darkens as it loads; recharge when it stops clearing the water.