Good advice
@callingcolleen1 and wow is it really supposed to freeze there on Monday? Been warm here and keeps on coming. Does not feel like Sept. It's in the 80's here now and will drop to the 70's for a couple days and then back up to the high 80's for all next week. Your pond looks so clear! Tell us how you keep the water so clear one of these days. I know you have the EZ filters but I think you have another kind also right?
I never have water quality problems and never needed a UV Sterilizer. I think it's because it runs year round, and I also have that really big yellow flag sedge, very good for photosynthesis filtration. I only have EZ Bio filters, 7 all together, 4 connected (2 per side then a "T" to pump) and three connected together to one pump. Also my ponds run from top to bottom, upper three ponds water level always the same roughly, and they have "spillways" that connects them all, and they all flow down creating a current that pushes most waste down stream to the "Jaws" of the yellow flag, that floats and has long roots that lick the pond clean. Fish also leave under that yellow flag all Winter, they can all disappear under that yellow flag in that pond. No fancy filtration or expense anything, so I think is a combination effect, between water running all year round from top pond down to bottom pond (the creek effect) that keeps upper ponds so clean and sparkling. That's it. I don't add anything other than to decloranate water.
Yep going to freeze according to forecast, and snow on the foothills. Right now it was super hot today and sitting outside by pond tonight and it's warm and we are all wearing shorts!