Are you letting the unit reprime when you turn it back on? It takes a couple of minutes.
2. Plug the unit into an electrical outlet.
The electronic automatic priming sequence will begin.
This is what will happen:
The pump will run for 2 minutes to fill the filter canister with aquarium water.
The pump will stop for 2 minutes to evacuate air from the filter canister.
The pump will start again; it will remain on and will run continuously until it is unplugged.
This sequence will repeat itself every time the unit is unplugged and plugged back in.
Approximately every 24 hours:
The pump will stop for 2 minutes to evacuate any air that may have become
trapped inside the unit.
75: blood parrots, featherfin cat, emperor tetras, turquoise rainbowfish, BN plecos, japanese trapdoor; 46: WCMM, gold inca snails, ghost, bamboo & amano shrimp, kuhli loaches, rummynose & ember tetras, endlers, platies, flame gourami, guppies; 16: pygmy, peppered, loxozonus corys, otos, assassins, RCS ... ~ Research PRIOR to purchase.... ~