My name is Patty. We have a 15x6x4'deep pond that my husband made. We have 2 large Koi & 10-15 goldfish. Our pond looks like a mud hole most of the time. He cleans it every other month & it is beautiful for a few weeks. I am now taking over the care of the pond but hardly know where to begin. I definitely know we need a new filter but don't know again where to start. Any suggestions will be greatly appreciated. I am a photographer & use the area for pictures (when it is presentable) Look forward to being a member on this forum.