Infinity Cal-Hypo tablets can only be used in a Pulsar Infinity erosion feeder. This tablet nor any other CAL-HYPO product can be used in a traditional TRI-CHLOR tablet feeder. Mixing these two different types of chlorine, even trace amounts, in the same feeder can result in dangerous chemical reactions, damage to equipment, and serious injury. If you are not sure what type of chlorine you need, please contact our office.