
I put a set of NEW batteries in then put the installation in the aquarium to one side. When I set it up after a few weeks and turned on the switch. both D batteries were DEAD! I added a new battery, tested it and it worked. Even though it's battery operated, it looks like it has a power surge, followed by a power outage and then a power outage, repeat that. Since it's designed to turn on during a power outage (which it does), use it I use it as a backup ventilation unit in my display aquarium in the event of a power failure. I have no faith in this block. I think I'm well behind the return time for him. I guess I'll leave it as a last resort in case of a long power outage. In the meantime I will buy another unit for backup coverage if the power goes out.

Powerful And Quiet Submersible Pump For Aquarium, Pond, And Hydroponics: KEDSUM 660GPH Pump With 6Ft High Lift And 3 Nozzles
29 Review

KEDSUM 330GPH Ultra Quiet Submersible Pump With High Lift And Grounded Power Cord - Ideal For Fish Tanks, Ponds, Aquariums, Statuary, Hydroponics - Includes 3 Nozzles And 1500L/H Water Flow
39 Review

Aquael Fan Filter Mikro Plus
35 Review

KEDSUM Quiet Rechargeable Battery-Operated Aquarium Air Pump With Dual Outlets - Perfect For Fish Tank, Outdoor Fishing, Transport, And Emergencies
28 Review

Steam cleaner Deerma Deerma DEM-ZQ610 EU, white/red
68 Review

π U-BCOO Aquarium Gravel Cleaner Fish Tank: Manual Siphon for Efficient Filter Gravel Cleaning and Water Change in Tanks
22 Review

π§² Efficient Magnetic Fish Tank Cleaner: KEDSUM Floating Clean Brush with Handle Design
34 Review

Jasonwell Magnetic Aquarium Fish Tank Glass Algae Cleaner - Floating Brush (L Size)
37 Review