This page contains video links that you may find useful.

Install an electric fence. This one was £95 and is mains powered. Simple to fit - and effective.

Once the pump has removed as much water as it can, use this method to quickly empty the rest of the water from the pond. Saves carrying sloppy buckets about.

The simple cleaning of the filtoclear filter makes them perfect for small to medium ponds.

Video showing effectiveness of air pump.