Modules Guide

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 disinfection, helps control bacterial growth in the system.

• If your area is exposed to chemicals such as pesticides, herbicides, or small amounts of heavy metals, you’ll want to include the Activated Carbon (Charcoal) Module. Activated carbon is very effective at adsorbing many dissolved contaminants that basic filtration can’t remove.

Because each module is independent, you can start simple and add more stages later as your needs change.

How the Modules Stack

All modules are designed to be physically stacked on top of one another, creating a vertical filtration train. Water flows from the top module down through each layer, getting cleaner at every step.

Below is our recommended configuration for best overall performance:

1. Large Particle Filter Module (Top)

2. Sand Module

3. Biofilm Module

4. Activated Carbon (Charcoal) Module

5. Solar Enclosure (Outer Shell)

Example Configurations

Here are a few example setups based on common needs:

• Budget‑Friendly, Basic Antibacterial Focus

  • Biofilm Module + Solar Enclosure

• Garden Use

  • Large Particle Filter → Sand → Activated Carbon

• Chemically Challenging Environments

  • Large Particle Filter → Sand → Activated Carbon → Biofilm → Solar Enclosure

Using and Maintaining Your Modules

• Start by deciding your primary goal: cost, antibacterial performance, chemical protection, or maximum overall quality.

• Stack the modules in the recommended order so each stage protects and enhances the next.

• Inspect the top stages (Large Particle Filter and Sand) more often, since they catch most of the physical debris.

• Replace or refresh the Activated Carbon Module according to usage, especially if you’re targeting chemicals and odors (every 6 months recommended).

• Treat the Biofilm Module gently and avoid harsh chemical cleaners so the beneficial microbial layer can stay healthy.

• Keep the Solar Enclosure clean to allow for maximum sunlight.

By understanding what each module does and how they work together, you can build a rainwater filtering system that’s tailored to your environment, easy to maintain, and optimized for sustainable clean water.