Why Is My EC Rising in DWC?

Why

As the water level drops, dissolved salts can become more concentrated, even while your plants absorb nutrients. Plants take up water and nutrients in different proportions, and evaporation removes water too.

EC is a guide to solution strength. It doesn't tell you whether individual nutrients are balanced.

So a rising number doesn't automatically mean you're overfeeding. Your meter measures conductivity, not your parenting skills.

Excess nutrients or minerals in top-off water can also build up. Unsuitable pH, low oxygen, or damaged roots can limit nutrient uptake. If water keeps disappearing while salts remain, EC can rise.

First, confirm the reading. Use a clean meter checked against a known EC standard, following its instructions. Mix thoroughly and let the temperature-compensated reading settle.

Check the water level and what you've added. If the level is low and EC is above your intended target, top off to your normal operating level with low-EC water, such as RO. Mix and recheck.

If EC is still high, review your additions. Remove some solution before replacing it with low-EC water to dilute without overfilling. If the mix is old or uncertain, a fresh, correctly mixed nutrient solution may be a better reset.

After topping off, diluting, or replacing the solution, mix, recheck EC, then check and adjust pH if needed.

If readings are back in range and growth looks healthy, keep monitoring.

If the plant is wilting, growing poorly, or has deteriorating roots, investigate pH, water temperature, aeration, and roots, even if EC returns to target. Dilution can fix the number without fixing the cause. EC alone can't diagnose root rot.