Blocking a return jet...damaging to pump?


Nov 7, 2012
I have four returns in my pool, and I use two spray devices when the pool is hot (Arctic Cooler) to try to reduce the temp. In order to get a higher spray mist from the Arctic Cooler, I need to completely block one return. That means that two returns have a spray device, one return has a plug, and only one return can operate unobstructed. When I do this, the water from the unobstructed return is super powerful. Am I doing any damage to the pool plumbing or pump by forcing so much of the water out of one return?