btw after checking the graph i found out that the pump only work at 1500 liter per hour at 1.5m. My tank could be slightly higher than that. And after using a online calculation i found my tank liters to be 254.85 liters. Which means i would only have a flow rate of 5x. I ask the person at eAN he said it okie but i would still like to hear frm u. As i would try not to fork out another $$60 to get a better pump.