Flood & Drain Fittings

What do Flood & Drain Fittings do in an ebb & flow system?

Flood & Drain Fittings control how nutrient solution floods into and drains out of your tray. The inlet pumps water up, and the outlet/overflow fitting sets your flood height and returns excess back to the reservoir automatically.

What parts come with Flood & Drain Fittings?

They’re sold as separate components: the inlet fitting, the outlet fitting (with riser), and a screen. The riser sets your water height, and the screen helps prevent media and roots from clogging the outlet drain.

How do I choose the right hole size and install the fittings?

Measure the threaded section and drill a matching hole using a hole saw. The gasket goes on the wet side (inside the tray). Avoid silicone unless your tray is rough or warped, and tighten snugly—not overly tight to prevent warping or leaks.

Why are my Flood & Drain Fittings leaking or not sealing?

Common causes include a rough hole edge, gasket not seated flat, over-tightening, or a warped tray. Reinstalling with clean surfaces and even pressure usually fixes slow leaks. A level tray is also essential for consistent sealing and drainage.

How do I set and adjust flood height?

Flood height is set by the outlet riser. Use more riser extensions for deeper floods, or fewer for shallow trays or seedlings. Don’t flood too high—just enough to saturate the root zone without keeping the surface constantly soaked.

Do I need a specific pump or flow rate?

Most submersible pumps work if they can lift water to tray height. Use enough flow to flood quickly but not so much that it overpowers the outlet or causes splashing. Add a second outlet or emergency overflow for high-flow systems.

Can I use Flood & Drain Fittings with clay pebbles or pots?

Yes—they’re ideal for both media beds and trays with pots. Just rinse pebbles thoroughly to prevent clogging, and always use the screen to catch debris or wandering roots. They also work with coco or soil in pots sitting in the tray.

How do I maintain and clean Flood & Drain Fittings?

Check regularly for slow drainage or root buildup. Remove the screen and riser, flush with warm water, and scrub off biofilm. Rinse well and reinstall. If draining is slow but not clogged, check for hose sags, kinks, or tray tilt.

What’s the best flood timing and cycle length?

Run floods long enough to reach your set water height, then stop. Flooding too long just wastes energy. Start with fewer cycles and increase as plants grow or conditions get drier. You can pulse feed with shorter cycles if needed.

What are the most common mistakes with Flood & Drain Fittings?

Overflooding, skipping the screen, and not leveling the tray are the top issues. For a no-drama setup: use a screen, keep the drain larger than the feed, level your tray, and test multiple cycles before leaving it unattended.

Why do I see algae or smell issues in my system?

Algae grows from light hitting wet surfaces. Reduce flood height and light exposure. If water smells stale, your reservoir may be too warm or under-aerated. Adding an air stone and keeping water clean helps prevent root issues.