I'm Tan here. I'm a professional pond builder based in KL. Regarding good and reliable water pumps, i would suggest that you use Tsurumi 40PU2.15S. VERY VERY RELIABLE AND LOW POWER CONSUMPTION! Only 150WATTS!
It is very low in maintenance as well. FULLY MADE IN JAPAN. For any enquiries please give me a call 012-2866926 or email me at firstname.lastname@example.org