Also if you do a blow by In the plumbing you can slow any sterilization unit down to 50gallons an hour if you wanted to. I wouldn’t recommend it but just saying.It's weird how the Pentair's have a much much much lower flowrate for parasites and bacteria, but the Aqua Ultra Violets are still in the thousands... Any idea why that might be? As I said in my other post here, I'm thinking about getting one and wanting to learn, right now they're nearly a mystery to me :-D