4 of 6 people found the following review helpful
Temperamental, but useful,
This review is from: Battery Operated Water Pump (482)-transfer Any Liquid In Minutes. Remove Flood Water.
I bought this to help with my weekly aquarium water change, so as to avoid having to mess around with siphons. It can be a bit temperamental in terms of water flow rate, but if isn't behaving then turning it off and then on again tends to resolve matters. A longer output hose would help - I'll have to organise an extension.
As someone who recently returned to fishkeeping after a long break, I was also planning to buy a separate gravel cleaner, but find that this does the job reasonably well. You have to take care to avoid sucking in gravel, so I tend to use the inlet end of the pump to stir up the gravel in the area I'm working on, but with the pump turned off, and then turn the pump on to suck up the disturbed detritus.