Produced by RP Aquatics, another premier aquatic product supplier from the UK,  Ammonia Block is a premium-grade, nitrate selective, ion-exchange resin. It removes Ammonia quickly and safely from aquarium water.
It can be used for up to 12 weeks during tank startup without interfering  with the normal bio media cycle.
The RP Aquatics round PODs are a unique aquatic application allowing unrestricted flow within the canister filter . The package contains 3 PODs.