Hello. A couple of years ago we moved from Virginia to Oregon for my wifes job. We inherited a rather simple 1500 gal. Koi pond when we purchased our home. Initially the pond had 6-large Koi and 7 ornamental goldfish. We sold the goldfish to a local pet store last year and are currently looking for a good home for two of our Koi. We’ve made a few upgrades since moving in. Last year we added a Matala EZ Air Pro 1 pond aerator, and recently added a Laguna ClearFlo 4000 UVC filter kit which I just installed last week. The pond has a bio-falls filter and a skimmer filter. There is no bottom drain or filter. In the late spring/summer about 2/3rds of the pond is covered with flowering pads. The fish love to hang out under the pads, especially in front of the skimmer and under the two waterfalls. Our bio-falls empties into on stream. About halfway down the yard it collects in a small pool where it pours into two streams that empty out into the pond. It’s a the main attraction in our yard. \n\nMy biggest problems are leaf control in the fall and winter and string algae and duckweed in the summer. I’ll be investing in a good net before the fall. I use an algaecide to control the string algae. I vacuum out the duckweed when it gets too bad. Any suggestions?