[Delphinus]

For what it's worth, one potential "con" to running the pellets in the manner I have chosen is this.

The pellets are porous (as they intended to be). This means when dry they will float. The zeovit reactor I am using has a check valve but it failed after 2 days (possibly due to a pellet lodged in it, I haven't yet had a chance to investigate the reason).

I was initially running the reactor on a 3 hours on / 3 hours off cycle (as per zeovit prescriptions). However with the failed check valve, the water level would drop back down to sump level which is approximately 1/4" lower than the top of the pellets, so 1/4" of the pellets would dry out during the "off" cycles. These would float up to the top of the reactor at the start of the next "on" cycle and ended up in the sump, some of which ended up getting sucked up into the sump return pump and spat into the display tank.

I'm not worried about the pellets in the main tank, they will eventually dissolve, but it's disappointing that there is a non-zero percentage of pellets are not in the reactor as was intended.

The pellets are also small enough to fit through the holes of the reactor and fall through to the outside chamber when the inside chamber is "pumped."

So there is a case to be made to suggest running these pellets in a separate reactor with a strainer on the output, such as a Phosban reactor.