We recommend filling your SpyraTwo with clean tap water only. Nevertheless, we have integrated a particle filter for your convenience. This filter prevents leaves and small particles from disrupting your gameplay. So if you want to use your SpyraTwo out in the wild - no worries! While the SpyraTwo works just as well with salt water and chlorinated water, it can damage the SpyraTwo and shorten its lifespan so we advise against it.