And thats all that matters is that it works for the person using it. When I pH it stabilizes quickly so that tells me its circulating just fine. Id need to do a dye test to accurately say how long it takes, but for me its fast enough. Im moving a lot more water than you since my system is quadruple the size. I went bulkheads cause I didnt wanna be bothered by all the leaky uniseal stories ive heard over the years. Aside for placing the gasket on the wrong side like a bonehead I havent had one leak. To me thats worth every penny.