Clean Rain Advanced Downspout Diverter

All-in-One Rainwater Filtration & First Flush Diverter for Your Downspout

The Clean Rain Advanced Downspout Diverter (SKU: FFADV) is a compact, all-in-one solution that combines a rainhead leaf filter, a Smart Sense™ first flush diverter, and a stormwater overflow in a single easy-to-install unit. It attaches directly to your existing gutter downspout and automatically routes clean rainwater into a storage tank, rain barrel, cistern, or garden — helping you conserve potable water and make the most of every rainfall.

The Clean Shield™ filter technology deflects leaves and large debris away from the screen to maximize flow and minimize clogging. The built-in Smart Sense™ first flush system automatically diverts the first, most-contaminated runoff (containing roof dust, bird droppings, and debris) to your storm drain — without any manual intervention. The unit body swivels 180° for flexible outlet positioning, and an on/off switch lets you pause collection between rain events. Installation requires only a drill and hacksaw, and no plumbing expertise. Note: Water may not divert to storage during very brief rain events, as sustained flow is required to fully activate the first flush mechanism.

• 3-in-1 Design: Combines rainhead filtration, Smart Sense™ first flush diversion, and stormwater overflow in one compact unit.
• Clean Shield™ Technology: Deflects leaves and large debris away from the screen, allowing higher flow rates and reducing maintenance.
• Smart Sense™ First Flush: Automatically diverts the initial contaminated roof runoff to the storm drain before cleaner water is routed to storage — no manual adjustment needed.
• Mosquito Barrier: Stainless steel mesh screening at the outlet prevents mosquitoes and other insects from entering your stored water supply.
• Multi-Fit Downspout Adapters: Includes adapters for the four most common downspout sizes: 2″×3″, 3″×4″ (rectangular), 3″, and 4″ (round).
• Flexible Outlet: Body swivels 180° and connects to standard garden hoses, 1″ sump hoses, 1½” pool hoses, and 3″ Schedule 40 PVC pipe for cistern hookups.
• On/Off Switch: Easily pause diversion between rainfall events with a front-mounted switch.
• Minimal Maintenance: Mostly self-cleaning design; the Clean Shield™ screen removes quickly via quick-release tabs for occasional rinsing.

Key specifications for planning your rainwater harvesting system.

Install your Clean Rain Advanced in minutes with just a drill and hacksaw.

Step 1: Cut the Downspout
Remove a 23.6″ section of downspout from the location where the Clean Rain™ will be installed. Ensure all cut edges are clean and smooth before proceeding.

Step 2: Remove the Clean Shield™
Lift the Clean Shield™ filter screen upward and outward using the quick-release tabs and set it aside.

Step 3: Attach the Downspout Adapter
Select the correct adapter for your downspout size (2″×3″, 3″×4″, 3″, or 4″) and fit it to the bottom of the Clean Rain™ unit.

Step 4: Mount the Unit
Slide the Clean Rain™ up behind the top section of cut downspout, then down firmly into position. Push until it seats completely. Secure the top of the unit through the provided screw slots using appropriate screws and anchors.

Step 5: Reinsert the Clean Shield™
Press the Clean Shield™ screen firmly back into place and confirm the installation is secure before the next rain event.

Step 6: Connect Your Storage
Attach a standard garden hose, 1″ sump hose, 1½” pool hose, or 3″ Schedule 40 PVC pipe to the outlet and route to your rain barrel, cistern, or storage tank.

Download the full installation instructions (PDF) →