Question for all the experts out there- I have a heavily planted 1500 gallon pond. I have two pumps, one sending water back into the pond from the overflow and the other going into a filter box. I have to clean the pre-filters every 2-3 days (plant debris). I was thinking about trying a filter cage. Anyone made one of these before? Bought one that worked well? Any other ideas? I want to go on vacation this summer and I'm not sure I would trust a house sitter to keep the water flowing.