I have a 1200 gal. pond I get a lot of crap on the bottom I was thinking about a bottom drain , Are they good or bad ? or do you think they will leak ? I think it would take a lot of crap off the bottom .I tried a Tetra pressure filter with the pump in the pond it did not work that good . I was thinking of a Aqua ultima 2 pressure I wood like to no if any one has a set up like that thanks Larry