I'm looking to replace my current Tetra pond filter on a 1000 gallon Koi
pond with something people are having good luck with....

The problem is my current filter needs to be cleaned at least once per
week. I have a fair amount of algae remnants which need to be hosed off
of the Prefilter pads once per week minimum. The filter itself also
drains slowly and can back up where the water level will slowly reach
the top. My pump may be a little strong for the filter and the filter is
also only rated at 1000 gal per hr max.
I'm looking for something low maintenance and of course clear water.

Any suggestions greatly appreciated....
John