21-7-7 Acid Hammer

Highly effective in irrigation water with alkalinity levels up to 300 ppm

21

N

7

P2O5

7

K2O
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21-7-7 Acid Hammer is an excellent solution to counter excessive pH in the growing media of acid-loving plants.

  • Reduces or eliminates the need for additional mineral acids

  • Safer to handle than traditional acids

  • Helps maintain green foliage on iron-inefficient plants

  • Customizing component provides consistent nitrogen uptake

  • No filler 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

Instructions

Dilute fertilizer in water using the mixing chart below . When trying to reduce the pH of high pH growing media, apply at 200 to 300 ppm nitrogen . Test pH after a few days and reapply if needed .

IMPORTANT: Do not mix in the same stock tank with calcium containing fertilizers . Do not use with pure irrigation water (alkalinity vless than 100 ppm).

 

Concentration (ppm N) fertilizerAverage alkalinity reduction (ppm total alkalinity)
100106
200119
300130
400141

 

 

Product properties

Potential acidity1,218 lbs. calcium carbonate equivalent per ton
Conductivity (100 ppm N)0.85 mmhos/cm.
Maximum solubility3.5 lbs./gal.

 

 

Weight (oz.) of product needed to mix one gallon of concentrate

Target concentration (N/ppm) after dilutionEC (mmhos/cm.) of target feed rate after dilution
Injector ratios
1:151:1001:1281:2001:300
250.21.62.13.24.80.21
500.53.24.16.49.60.43
750.74.86.29.614.50.64
1001.06.48.212.919.30.85
1251.28.010.316.124.11.06
1501.49.612.319.328.91.28
1751.711.314.422.533.81.49
2001.912.916.525.738.61.70
2502.416.120.632.248.22.13
3002.919.324.738.6EMS2.55
3503.422.528.845.0EMS2.98
4003.925.732.951.4EMS3.40
4504.328.937.0EMSEMS3.83
5004.832.241.2EMSEMS4.25
6005.838.649.4EMSEMS5.10
EMS = exceeds maximum solubility

 

 

Gallons of water needed to dissolve one 25 lb. bag of fertilizer

Target concentration (N/ppm) after dilutionEC (mmhos/cm.) of target feed rate after dilution
Injector ratios
1:151:1001:1281:2001:300
251658.9248.8194.4124.482.90.21
50829.4124.497.262.241.50.43
75553.082.964.841.527.60.64
100414.762.248.631.120.70.85
125331.849.838.924.916.61.06
150276.541.532.420.713.81.28
175237.035.527.817.811.81.49
200207.431.124.315.610.41.70
250165.924.919.412.48.32.13
300138.220.716.210.4EMS2.55
350118.517.813.98.9EMS2.98
400103.715.612.27.8EMS3.40
45092.213.810.8EMSEMS3.83
50082.912.49.7EMSEMS4.25
60069.110.48.1EMSEMS5.10
EMS = exceeds maximum solubility

1
Consult rate tables printed on bag labels.
2
Verify product analysis and rate for plants in your production system (for assistance, contact your regional ICL Territory Manager or for testing, call the ICL Lab at 877-467-8522).
3
Irrigation frequency and volume should be adjusted during the crop production cycle according to crop type, environmental conditions, and desired soluble salt levels.
4
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).
5
Store in a clean, cool, dry place.

Brand details

This product is part of the Peters Excel pHLow portfolio

The acidifying action of Excel pHLow stabilizes pH levels in all types of growing media.

Learn more about Peters Excel pHLow
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