Review on Saim Portable Aquarium Battery Operated by Doris Allen

Excellent durable housing, well sealed engine/electrical compartment. Absolutely horrible diaphragm pump design, the rotating shaft of the pump simply inserts into a hole in the diaphragm arm that rises and falls towards the pump. Used twice for 6 hours each. Then it broke, all worn out where the rod sits and no longer held in hand. Bad design. Fix it and this pin will be 5 or even 7 stars.