Make sure the sponges are in place and pour into the reactor, do not rinse it first. Follow the instructions that come with the unit, they are good and easy to folllow.
Try not to pour any into the center tube when filling.
The PB reactor comes with enough PB to work on a 150 gal
tank so if your tank is smaller only use what is needed.
make sure you hook the hoses up right and when you first use it drain off the first 2+ gallons of water that flow throught the reactor. You do NOT want any of the rusty colored water to get into the tank.
Adjust the flow so that top layer of PB rumbles around, you dont want real fast flow here, slow is better.