Product Code


Peters Excel pHLow 19-11-21, Multi-Purpose with Black Iron

  • Advantages
  • Recommended Rates
  • Directions
  • Download Product Sheet
  • base formulation—can be used alone or rotated with a customizing component
  • effective for water types 2, 3 and 4
  • 100% water soluble 
  • pure formulation—no ballast substances
  • effective for all water types
  • elevated levels of chelated trace elements ensure robust growth and rich color
  • contains NPK, magnesium and micronutrients
  • developed for peat-based cultures (pot plants, bedding plants and container nursery stock)
  • exclusive M-77 chelating formula for fast, efficient nutrient uptake
Recommended Rates


Weight (In Ounces) Of Product Needed To Mix One U.S. Gallon Of Concentrate

Target Fertilizer
Concentration (ppm N)
After Dilution

Injector Ratios

EC mmhos/cm of
Target Feed Rate After Dilution

1:15 1:100 1:200
50 0.5 3.2 6.4 0.43
100 1.0 6.4 12.9 0.85
200 1.9 12.9 25.7 1.70
300 2.9 19.3 38.6 2.55


Gallons Of Water Required To Dissolve One 25 Lb Bag Of Fertilizer

Target Fertilizer Concentration
(ppm N) After Dilution

Injector Ratios
1:100 1:200
50 124.4 62.2
100 62.2 31.1
200 31.1 15.6
300 20.7 10.4

For a complete list of target concentrations (ppm N), please refer to the Product Information Sheet.

Mixing for watering cans, spray tanks (no injectors)

Amount of Fertilizer       +       Amount of water (gallons)  =       Approximate ppm N
1 tsp. 1 283
1 tbsp. 2 425
1 cup 25 544


  • consult rate tables printed on bag labels
  • verify product analysis, longevity and rate for plants in your production system (for assistance, contact your regional ICL-SF Territory Manager or call the ICL Lab at 877-467-8522)
  • irrigation frequency and volume should be adjusted during the crop production cycle according to crop type, environmental conditions and desired soluble salt levels
  • a product trial is recommended before adopting a new fertilizer program or making full-scale changes to standard cultural practices (test several rates on representative plant types)
  • store in a clean, cool, dry place

Versatile, multi-use formulation provides plants with the nutrition they need to thrive while easily and effectively managing irrigation water alkalinity. Contains three chelated irons, including black iron—the most effective for growing ornamentals.