Just a quick heads up, I uploaded six videos to my youtube channel with information how to install and maintain RO/DI systems. While the information pertains to those sold by Melev's Reef, you may find some helpful tips as well for the system you currently own. These are the videos I uploaded: How to install your RO/DI system: https://youtu.be/-XVjoJDWG7Q How to change filters: https://youtu.be/NfL1SDsIkQ4 How to change the membrane: https://youtu.be/JTtuHfwyXVo How to change the ASOV: https://youtu.be/ij2R_EvPOVY How to remove the tubing: https://youtu.be/qHUJYwEFkBg How to measure TDS correctly: https://youtu.be/KD0YZgBQoDY