The frequency at which you should use pool cleaner liquids depends on several factors, including product guidelines, how often the pool is used, and the level of contamination present in the water. Generally speaking, most people find it beneficial to put in one dose every few weeks, but this could vary depending on individual circumstances. It’s always best to follow the instructions on the pool cleaner label, and if you're unsure or feeling out of your depth, it's not a bad idea to consult with a professional once.