Hi! I just joined this forum and wanted to introduce myself. I live in Tulsa, OK and have a 2000 outdoor koi pond. We have 4 very distinct seasons here in OK (not to mention all the tornados this month! ugh). It gets up to 115 in the summer (gotta keep the water cool), and down in the teens in the winter which causes serious string algae in my pond. Our pond is built on a hill and has a 20' stream leading into the pond. The stream has 3 small falls, and then we have a 2 foot fall that falls into the main pond. I will try to upload a pic soon for my profile pic. Anyway - any advice is very much appreciated!! Thank you!! I hope to learn a lot from all of you 
Gail
Gail