I have a six month old pond . I have a three barrel filter system that doesn't work well. I haven't finished the pond yet and need help on how to rework them this fall. The barrels are level with the water level. They get water from a bottom drain with two inch pipes. Now the first barrel is for settling only, the next two have a floating media in them. I also have a small water fall feed from a skimmer. I was thinking of pulling out the barrels and the go back with concreate blocks to make larger chambers. The pond will also have a veggie pond the same size to help. How do I proceed? The pond is 14,000 gallons with one pump of 7500 gph. Thanks for any help.