Calculate nutrient solution strength
Part A
80
ml
Part B
80
ml
Target EC
1.4 mS/cm
Target PPM
980
pH Down (estimated)
Start with this amount, then adjust to pH 5.8-6.2
10 ml
Actual amount varies based on your water source. Always measure pH after mixing.
Never Mix A + B Concentrated
Always add Part A to water first, stir, then add Part B separately.
Adjust pH Last
Add nutrients first, then adjust pH to 5.8-6.2 range.
Inputs
Result
EC = 1.4 x 1.0 = 1.40. PPM = 1.40 x 700 = 980. Part A = 20 x 4 x 1.0 = 80 ml. Part B = 80 ml. pH Down = 20 x 0.5 = 10.0 ml.
Inputs
Result
EC = 1.8 x 1.25 = 2.25. PPM = 2.25 x 700 = 1575. Part A = 10 x 4 x 1.25 = 50 ml. Part B = 50 ml. pH Down = 10 x 0.5 = 5.0 ml.
Seedlings: 0.5-0.8 EC (350-560 PPM). Vegetative: 1.0-1.6 EC (700-1120 PPM). Flowering/Fruiting: 1.6-2.4 EC (1120-1680 PPM). Adjust based on plant response.
PPM = EC × 500 (Hanna scale) or EC × 700 (Truncheon scale). Most nutrient companies use the 700 scale. An EC of 2.0 equals 1400 PPM on the 700 scale.
Change the reservoir every 1-2 weeks, or when nutrient levels become unbalanced. Top off with plain pH-adjusted water between changes to maintain concentration.
Most plants prefer pH 5.5-6.5, with 5.8-6.2 being ideal. Some nutrients become unavailable outside this range. Check and adjust pH daily.
Plan your growing systems
Last Updated: Feb 12, 2026
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