I have a rainwater tank used for toilet and laundry. It has an external pump controller and a submersible pump BIanco 800 watts which need replacement. I have been to Bunnings shop and asked around but no one seem to be able to help me. There are submersible pumps in Bunning such as Ozito, Karcher and Ryobi etc. I dont know if this can be used in my rainwater tank. Pls help