What is a downspout filter & why it matters
A downspout filter (also known as a downspout screen, leaf catcher, or rain head) is a device installed either at the top of a downspout (where it connects to the gutter), along its vertical run, or at its base. Its primary purpose is to capture and deflect debris that manages to get past gutter guards or falls directly into an open gutter. By preventing this debris (leaves, twigs, shingle grit, seeds) from entering the narrower downspout pipe, the filter plays a critical role in maintaining the entire drainage system’s efficiency.
Benefits: debris prevention, clog reduction, system protection
- Superior Debris Prevention: Acts as a second line of defense against clogs, catching smaller debris that might slip through gutter guards or larger items if gutters are open.
- Clog Reduction: Significantly reduces the likelihood of downspout clogs, which are often harder to clear than gutter clogs and can cause water to back up and damage fascia or foundations.
- System Protection: Protects underground drainage pipes, rain barrels, and cisterns from debris accumulation, ensuring their long-term functionality and reducing the need for costly cleaning.
- Reduced Maintenance: While not eliminating all cleaning, it drastically reduces the frequency and difficulty of downspout and gutter cleaning.
- Improved Water Quality: For rainwater harvesting systems, filters ensure cleaner water enters your rain barrels, reducing sediment and organic matter.
Popular types & brands
Downspout filters come in various designs to suit different needs:
Leaf Eater
Leaf Eater filters (often a brand name for a type of “rain head”) are typically installed at the top of a vertical downspout, usually just below the gutter outlet. They feature a large, angled screen that deflects leaves and coarse debris, allowing clean water to pass through. They are excellent for shedding heavy leaf loads and are often self-cleaning due to their design.
WISY stainless steel
WISY is a high-end brand known for its precision-engineered stainless steel downspout filters. These are typically inline filters installed within the downspout, often used in rainwater harvesting systems. They feature fine mesh screens that filter out even very small particles, ensuring high water quality for cisterns and other applications. Their robust construction provides exceptional durability.
Amerimax Flex Grate
Amerimax Flex Grate (and similar products) are simple, flexible plastic grates designed to be placed at the bottom of a downspout, or sometimes at the top of an underground drainage pipe. They prevent larger debris from entering the downspout or drainage system while still allowing water to flow. They are very inexpensive and easy to install, serving as a basic but effective barrier.
How to choose the right filter
- Type of Debris: If you have heavy leaf fall, a Leaf Eater style is effective. For fine grit or pollen, a micro-mesh downspout filter is better.
- Location: Filters can be at the top of the downspout (rain head), mid-section (inline), or bottom (grate). Choose based on your gutter system and desired debris removal point.
- Rainwater Harvesting: If connecting to a rain barrel or cistern, a finer filter (like WISY) is often preferred for cleaner water.
- Budget: Simple grates are inexpensive; sophisticated inline filters are pricier.
- Ease of Maintenance: Consider how easy the filter is to access and clean.
Installation & replacement guide
- Top-of-Downspout/Rain Head (e.g., Leaf Eater):
- Cut a section out of your downspout at the desired height (usually chest level for easy access).
- Insert the filter unit, ensuring it’s oriented correctly to deflect debris.
- Secure with screws if required and seal any joints with silicone caulk.
- Inline Filter (e.g., WISY):
- Cut the downspout at the specified height.
- Insert the filter unit into the downspout sections.
- Secure the filter unit with clamps or screws and seal all connections.
- Bottom Grate (e.g., Amerimax Flex Grate):
- Simply push the grate into the bottom opening of the downspout, ensuring it sits snugly.
- Replacement: Follow the uninstallation steps in reverse. Regular checks can determine when a filter needs cleaning versus full replacement (due to damage).
Maintenance frequency & cleaning tips
- Frequency:
- High Debris: Filters in areas with heavy tree coverage may need cleaning monthly or bi-monthly during peak seasons (fall, spring).
- Moderate Debris: Quarterly or bi-annually is often sufficient.
- Low Debris: At least once or twice a year.
- Cleaning Tips:
- Leaf Eaters: Simply open the hinged cover and brush off or rinse accumulated leaves.
- Inline Filters: May require opening access panels or removing the filter screen for a thorough rinse with a hose.
- Grates: Lift out and brush off debris.
- Always wear gloves. Use a stiff brush or a garden hose to clear debris. For stubborn clogs, a small trowel might be needed.
Troubleshooting common issues
- Overflow at Filter:
- Cause: Filter is clogged with debris, or the filter’s flow capacity is insufficient for the amount of rainfall.
- Fix: Clean the filter thoroughly. Consider a larger capacity filter or a different type if the issue persists.
- Water Backing Up in Gutter:
- Cause: Downspout filter is completely blocked, preventing water from draining.
- Fix: Clear the filter immediately. Check the rest of the downspout and gutter for clogs too.
- Leaks Around Filter:
- Cause: Improper installation or degraded sealant.
- Fix: Ensure proper fitting and reapply exterior-grade silicone sealant at all joints.
Protect your gutters and home from costly clogs! Explore top-rated downspout filters and professional installation from All Gutters. Get a free quote today!