Flushes + Leaches

Why Flushing & Leaching Matters

Repeated feeding can leave heavy elements and salts in substrates and plant tissues. Flushing growing media and tapering inputs before harvest clears the excess, allowing the plant to express its true character—improving aroma, taste, and consistency. In active systems, leaching also restores a “clean slate” after overfeeding events, helping roots re-establish proper nutrient balance quickly.

Benefits

Cleaner Root Zone & Better Finish

Removes accumulated salts to reduce stress, improve flavor and fragrance at harvest, and promote smoother post-harvest quality.

Faster Recovery from Overfeeding

Dilutes and clears excess nutrient solution in media or systems to bring EC/PPM back into range, minimizing growth stalls.

Improved Nutrient Uptake

Prevents lockout by rebalancing the root environment, supporting steady uptake of essential elements in late flowering.

Best Uses

Correct nutrient burn or salt buildup; pre-harvest finishing flush; between-cycle reset of pots and lines; routine maintenance flushes to stabilize EC/PPM and protect pumps, emitters, and valves.

Types of Flush & Leach Solutions

Pre-Harvest Flush Formulas

Low-residual solutions designed for the final stage of flowering to clear stored salts and enhance natural aromatics.

Media Leaching Agents

Formulated to rinse substrates (coco, peat blends, soilless media) and remove surface and profile salt accumulations.

Enzymatic & Chelating Cleaners

Target stubborn deposits and organic residues, assisting in dissolving salt bonds and improving solution clarity.

How This Collection Helps Growers

From greenhouse benches to vertical farms, proper flushing safeguards plant vigor, reduces variability, and supports repeatable SOPs. By restoring balance in the root zone and media, growers see more uniform development, fewer corrective interventions, and a cleaner, more market-ready finish.

Frequently Asked Questions

What is flushing in hydroponics?

Flushing is the process of running clean water or a dedicated flushing solution through a system or media to remove excess salts and residual fertilizers. It can be used as routine maintenance, to correct overfeeding, or as a finishing step before harvest.

Does flushing reduce yield?

When timed and executed correctly, flushing should not reduce yield. Instead, it helps prevent stress from salt buildup and improves final quality. Over-flushing far in advance of harvest may slow growth, so follow manufacturer timing and monitor EC/PPM.

How long to wait after flushing can you harvest?

Most programs call for a finishing flush over the final days of flowering. The exact window depends on crop type, system, and solution used—commonly 3–10 days. Track trichome or maturity targets and maintain adequate irrigation to avoid drought stress during this phase.

How to flush a hydroponic system?

Drain the reservoir, fill with clean water or a flushing solution, and circulate to rinse lines, emitters, and root zones. Monitor EC/PPM until readings stabilize at the target. Replace with fresh solution as needed and resume your standard schedule when balance is restored.