I bought this pump to use while changing water. To and from a water reservoir (220L tank). It worked fine submerged until you speed up the power above 7 out of 10. I winds up, but then just cuts off, before it tries again, we’re the same thing just happens. So this is useless if you need it to work on full power, as I needed. They would not give me a new pump or refund for the broken pump. They just stopped replying.
all good a++++