I have a small 300 gallon pond and a 5w uv clarifier. I'm running a solar pump in it and it just isn't doing the job because (I think) it doesn't run at night and it can't catch up with the alge (I'm assuming) . The solar pump is 460gph... But there is no way it's pumping that because it has to go uphill.... and it's a cheap solar pump. The tetra 5w clarifier suggests 330gph max. I'm going to buy a plug in pump that can run all night but I don't know what size! I'm attaching a picture if the small hill behind the pond. Would a 480gph pump be to much even if it's pumping uphill to the clarifier. The tube it's going through is probably about 10 feet long. With about a 3 ft rise over or 6 foot distance. I think it's a 5/8 tube that we have converted to 3/4 at the opening of the clarifier. I have no idea how to figure out what I need. Am I getting to technical? As a side note I have about a 100 gal stream and waterfall that circulates through to pond and down to a small holding pond thats a much larger pump and filter system so the pump for the clarifier is it's own thing.