1.5 HP swimming pool pumps are larger and occasionally more powerful than many other swimming pool pumps in the industry. These pumps are also geared toward large pools with more features, like waterfalls, a negative edge or a waterslide.Most swimming pool pumps come in one of four sizes: ¾ HP, 1 HP, 1.5 HP, and 2 HP. As mentioned above, if you do have a large swimming pool or one with ample water features, you may be better served choosing a pool pump that runs on 1.5 horsepower. Pool Express has a huge variety of 1.5 HP pumps and even 2 HP pool pumps. They’re ideal for pools that require more power.