So, now that you guys steered me away from bottom drains in a gravel and rock bottom pond what filter system would you recommend? In the past I have installed aquascape for all my customers, but this pond is for me, and I can't help but feel there is a better way. I am not looking to get into some technical koi pond, although I do plan on having some koi in the pond. This attached picture is a pond we did for a cust. I am thinking something similiar, with a better planting scheme. I'm open for some filter / construction ideas .