Hello from Minnesota! I joined because I am addicted to ponds! I have two one is about 1200 gal and the other is 300 gal approximately. I have built one for my mom and got her addicted too. Every couple years we go just a little bit bigger. LOL I am having trouble with my bigger one. I have a jabao filter and can't find the right size replacement pads, I have decided that this company doesn't stand behind their product. But I hate to buy a new filter system. What external system with UV do you all like? Thanks much!!