Purigen® is designed for both marine and freshwater use.
Why It's Different

Selectivity: Purigen® is the highest capacity organic filtration resin on the market. No other products can compare to its ability to clear haziness and polish water to unparalleled clarity. Unlike other products on the market which are simple ion-exchange resins, Purigen® is specifically designed to be an organic scavenging resin. When ion-exchange resins are filled to capacity by metals and other contaminants, Purigen® has barely begun to reach its potential. Purigen® generally ignores simple elemental compounds, having an extreme affinity for nitrogenous organics. The primary source of nitrogenous compounds in an aquarium is waste. Fish, corals, even plants produce nitrogenous waste. Purigen® removes that waste faster and more completely than anything else on the market.
Capacity: Purigen’s™ possesses enhanced capacity owing to its vast surface area. All other resins on the market are purely spherical extruded beads. These beads remain smooth even under a microscope. Purigen® is both spherical and macroreticular. It has microscopic pores that increase its usable surface area to many times that of a purely spherical resin.
Regeneration: Purigen® can also be regenerated. As it adsorbs waste products, Purigen® will change color from a pale blonde to a dark brown, almost black. Once it is exhausted, it can be regenerated with a solution of bleach and water. The bleach will literally “burn off” the organics that have been removed from the tank. Watch out for products that claim to be regenerable with a brine solution. That is the regeneration procedure for ion-exchange purposes. A brine solution will not remove organics. While such resins have a limited capacity for organic adsorption, a brine regeneration process only replaces removed ionic compounds. It does not destroy large organic molecules that were removed, which is the primary function of organic adsorption resins.
Directions

Rinse before use. Use in a fine mesh filter bag.
Each 1 L treats up to 4,000 L (1,000 gallons*) for up to six months.
Exhaustion is indicated by a pronounced discoloration of the beads to dark brown or black.
Regeneration: Soak in a 1:1 bleach:water solution for 24 hours in a non-metalic container in a well ventilated area and away from children. Rinse well, then soak for 8 hours with a solution containing 2 tablespoons of ChlorGuard™, Prime®, or equivalent dechlorinator per cup of water. Rinse well. For freshwater use, soak for 4 hours with a solution containing 1 tablespoon of buffer per cup of water (Discus Buffer™, Neutral Regulator™, or Acid Buffer™). Original color and full activity should now be restored and Purigen® is ready for reuse. Caution: some slime coat products may permanently foul Purigen® and render regeneration difficult. Do not reuse if odor of chlorine is detectable. In case of doubt, soak beads in small quantity of water and test for residual chlorine with a chlorine test kit.
The Facts Purigen: -
Q: When is Purigen®exhausted and how do I regenerate it?
A: Purigen will turn from its normal color to a deep brown when it is exhausted. Purigen can easily be regenerated by soaking it in a solution of hyperchlorite (generic) bleach overnight. The Purigen®will return to its original color. Then rinse well and dechlorinate using Prime®or Safe™to remove any chlorine. For freshwater, use a buffer to adjust the pH as needed due to bleach’s high pH.
Q: Will Purigen®reduce GH (general hardness; calcium/magnesium ion levels)? Is it meant to be a substitute for activated carbon or should it be used with carbon?
A: No, Purigen®will not impact calcium/magnesium hardness. It is superior to carbon in removing organics and not having negative impacts, but it is also compatible with carbon. The use of carbon with Purigen®will extend the useful life of Purigen.
Q: On some of the Purigen® documentation I have read it says that some slime coat products can contaminate Purigen® and render it toxic. Can you identify these products ?
A: Only certain slime coat products will cause Purigen® to become toxic; the products that do this are amine based. Prime® and Safe™ are not amine based and so will not cause this problem. If you're curious, what happens is that the amine compounds can strongly bind to the resin, then when they (the amines) come into contact with any chlorine they will form chloramines which are highly toxic. We offer a stress coat product, StressGuard™, which is not amine based and so can be used in conjunction with Purigen.™
Q: I recently just regenerated the Purigen product. In the end, I used your neutral buffering product for the final process rather than the Discus or acid bufferer like suggested. It was under my rational that the reason we use the buffer was that the regeneratory process basically renders the product as at one extreme end of the PH scale. We are basically just preventing it from affecting our overall PH by buffering it. Since I strive to keep my aquarium at a PH of 7.0 was this a correct action on my behalf ?
A: This was a correct assumption and I do not see a problem with your action. As a precaution, I would test it in a cup of water (preferably RO or DI). If putting the fully regenerated product in DI water results in the pH of the DI water rising above 8.0, I would reintroduce the resin to a solution of Neutral Regulator for a few hours.
Q: Does AP Stress Coat foul/ruin your Purigen product?
A: If they use an amine based polymer it will not foul the resin but will render it non-regenerable. What amine based polymers will do is bond not just to Purigen but to any organic scavenging resin as well as any ion exchange resin and when you attempt to regenerate the resin they will then bond with the chlorine to form chloramine which can be released into the aquarium. This is not just an issue with Purigen but with all resins being sold in the pet trade. The problem only occurs when one attempts to regenerate the resin, there is no problem unless you wish to regenerate the resin you are using. Seachem products do not contain amine based polymers and are safe to be used in conjunction with not only our resins but also with other companies resins.