Whether or not you should put a tarp under your Intex pool depends on a few factors. First, consider what type of ground you have. If you have grass, putting a tarp down will help protect the bottom of the pool from rips and holes. However, if you have concrete, a tarp is not necessary and can actually cause more harm than good. Second, think about how often you'll be using the pool. If you plan on using it frequently, a tarp will prolong the life of the pool by protecting it from wear and tear. However, if you only plan on using the pool occasionally, a tarp may not be worth the hassle. Finally, consider the weather conditions in your area. If you live in an area with high winds, a tarp can help keep the pool from being blown over. However, if you live in an area with mild weather, a tarp may not be necessary. Ultimately, whether or not you should put a tarp under your Intex pool depends on your individual circumstances.