@ geckos6.... how are you filtering your pond??? I am THINKING of building one but the problem that i visualize is how to filter it...
Hello kid9, trick is to see a pond as a toilet bowl. If there is no drain, then the rubbish stays at the bottom in the pond making the water eventually very dark, dirty and stinking.
So after picturing that toilet bowl, the next step is to think on how to take the rubbish out. 3 ways I can think of...keep that toilet in your mind and think what you like best...
1. Use a net or change water with a drain pump. Not very useful, very high water bills, dirty job at best..
2. Use a pump at the deepest point and let it go through filter matts and bioballs. Closer, but the pump will chop everything very small or get stuck in big rubbish and then you have to clean a very dirty and stinky filter again...
3. Use a drain to feed that dirty rubbish automatically to a settling tank and then pump the clean water to a filter or bog to do bio-filtration.
Number 3 is what you want, thats where you get big stuff out, clean water back.
There are a lot of good plans and tips for building a pond that stays clean. Just keep that toilet-picture in mind and think: Bottom Drain Bottom Drain Bottom Drain...