Do you have a swimming pool pump that doesn't seem to be working properly? A dysfunctional swimming pool can be a big problem. Your pump is responsible for pulling water into the filter, where the water is then treated and cleaned. Without a working pump, water won't flow into the filter. That means that your pool water could develop odor, an unpleasant tint, or even a film of bacteria. Some pool pump issues are mechanical and require professional help.