TotalPondMF13015 Mechanical & Biological Filter for Up to 500 Gallon Ponds with Pump

How long does this typically take to filter an clear a 125gallon pond with green water?

What is the difference between this model and MF002P?

I just need a bit more power... is there a larger pump compatible with this box? Will a larger pump fit in same box?

How long is the power cord on the pump?