I bought these to use as a circulating pump in my 5 gallon tank. The flow rate range is wide enough for me, I use about the minimum flow rate. Has been running non-stop for a month now with no problems. The only small problem is that the power cord is too thick for the size of the pump. The force generated by the cable causes the pump to move and makes it difficult to find a suitable position and position of the cable. It looks like the manufacturer just used what was available. A thinner electrical cord fits such a small device and makes installing the pump easier.
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