Each module in the DropTank system is designed to work on its own or as part of a complete stack. This flexibility lets you build exactly the setup you need for your climate, budget, and water‑quality goals. Choosing the Right Modules You can mix and match modules based on what matters most to you: If you want to prioritize low cost and antibacterial performance, the Biofilm Module and Solar Enclosure may be all you need. This combination focuses on biological cleaning and UV