Our GASC line of ceramic plate diffusers provide an economical, long lasting solution for oxygen addition. These ceramic plate style diffusers are well known throughout the global aquaculture industry, and are designed to provide the finest bubble possible, which allows more oxygen to be absorbed into the water without increasing the amount of oxygen used. Max pressure is 50 PSI, but we recommend staying below 35 PSI to prolong the life of the diffuser. It is important not to add pressure rapidly, as that will cause diffuser failure.