Tools you might need next
Calculate hydroponic NPK nutrient mixing ratios and ppm targets for vegetative and flowering stages. Reservoir dosing guide.
Convert hydroponic EC (mS/cm) to PPM (TDS) and back. Supports 500 and 700 scale conversion factors for all popular nutrient meters.
Calculate grow light coverage, PPFD, and DLI for indoor hydroponic and cannabis cultivation. LED wattage and hanging height guide.
Smaller reservoirs change pH faster per ml of adjuster. Start with 1 ml per 10L, stir, wait 15 minutes, remeasure.
ΔpH per ml ≈ f(Volume, Buffer capacity, Product strength)Maintain pH in the optimal uptake zone. Iron locks out above 6.5; manganese below 5.5 in some systems.
Most crops: 5.5–6.5 | Blueberries: 4.5–5.5Never dose entire calculated amount at once. Overshooting pH requires counter-adjustment that adds unwanted salts.
Dose → Wait 15 min → Remeasure → RepeatUpdated: July 2026
20L reservoir needs pH Down — start with 2 ml, wait, remeasure. Target 6.0 for mixed lettuce and herb crop.
Reservoir pH crept from 6.0 to 6.8 over 10 days — add 1 ml pH Down per 20L and investigate root exudate or media contamination.
Pure RO water at pH 7.0+ before nutrients — adjust to 5.8 before adding concentrates to prevent nutrient lockout during mixing.
Hydroponic nutrients absorb best within specific pH ranges — typically 5.5–6.5 for most crops. Enter current pH, target pH, and reservoir volume to estimate milliliters of pH Up (potassium hydroxide) or pH Down (phosphoric/nitric acid) needed.