Update: We are now into our 4th pool season with these.We have a 27,000 gallon pool in Dallas. In July and August, the water temperature will rise to about 92 degrees if we don't use the cooling sprayers. With the sprayers, the pool stays around 82 degrees. We run 9 hours per night, from midnight to 9am. We have 5 return jets. We installed 2 of these coolers, and blocked the other 3 return jets. We have a variable flow pump, Pentair Intelliflo VSF, with the flow rate set high enough to make sure that water is coming out the top holes of the spray tower, and the spray from these top holes lands about 3 to 4 feet out into the pool. When we bought these spray towers, each one came with one screw plug to block a jet. A quick trip to the hardware store was needed to buy enough plugs to block the jets not connected to the 2 sprayers.A bit more info about our setup. We have an adjustable flow rate pump (Pentair VSF), this is more advanced than adjustable speed (RPM). Being able to set the flow rate makes it easy to dial in how hard to push water out of the sprayers as well as making sure the pool water is turned over enough times per day for cleaning/chlorination purposes. This pumps ability to keep a consistent flow rate is useful to maintain a consistent sprayer output even as the filter slowly builds up back pressure between cleanings. Our pool equipment is next to our bedroom window. To keep the pump noise down, we prefer to run the pump as slow as we can get away with. Slower pump = less noise. Another benefit of running slower is that pumps are much more energy efficient at lower speeds (slower speed = more gallons filtered per kwhr of electricity used). However, the cooling towers are more effective at higher flow rates where they spray farther through the air, causing more evaporative cooling. It is a tradeoff.