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Fertilizer Burn Recovery Protocol – Online Flush Calculator

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Fertilizer Burn Recovery Protocol

Online Flush Calculator – Save your plants from nutrient overdose

Plant & Nutrient Details
in
Most plants recover well below 1.2 mS/cm
Flush Protocol

Enter pot size and concentration details to generate a tailored flush plan.

Frequently Asked Questions

Fertilizer (nutrient) burn occurs when salts accumulate in the growing medium, drawing moisture away from roots and causing leaf tip burn, yellowing, or wilting. Flushing with plain, pH‑balanced water dissolves excess salts and carries them out through drainage, restoring safe root conditions.

Signs include brown or burnt leaf tips/edges, dark green curling leaves, slow growth, and a high runoff EC compared to input feed. A quick runoff test can confirm salt buildup.

As a rule of thumb, use 2‑3 times the pot volume of clean water. Our calculator gives a precise recommendation based on pot size, media water‑holding capacity, and the difference between current and target EC. Always split the flush into multiple smaller applications for best results.

Yes, but severe damage may already be permanent. Flush immediately, trim dead leaves, and place the plant in mild conditions. After flushing, skip nutrients for at least a week and reintroduce at quarter strength only when new growth appears healthy.

Use water adjusted to the same pH you normally feed (typically 5.8–6.5 for soilless/peat, 6.0–7.0 for soil). Proper pH ensures nutrients can be leached efficiently and prevents additional stress.

Coco and rockwool hold more water and may require slightly different flush volumes. Soil drains slower, so extend the interval between successive flushes. Our calculator accounts for typical water‑holding capacity of each medium.

EC (electrical conductivity) is universal; PPM depends on the conversion scale (500 or 700). Our tool lets you work with either — just choose your preferred unit, and calculations are converted automatically using the correct factor.

Wait at least 5–7 days and only resume feeding when the plant shows signs of recovery (new growth). Start with a very dilute nutrient solution (¼ of usual strength) and gradually increase over a couple of weeks.
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