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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.
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Reduces or eliminates the need for additional mineral acids
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Safer to handle than traditional acids
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Helps maintain green foliage on iron-inefficient plants
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Customizing component provides consistent nitrogen uptake
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No filler substances
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Effective for all water types
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Elevated levels of chelated trace elements ensure robust growth and rich color
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Contains NPK, magnesium and micronutrients
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Developed for peat-based cultures (pot plants, bedding plants, and container nursery stock)
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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) fertilizer | Average alkalinity reduction (ppm total alkalinity) |
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100 | 106 |
200 | 119 |
300 | 130 |
400 | 141 |
Product properties
Potential acidity | 1,218 lbs. calcium carbonate equivalent per ton |
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Conductivity (100 ppm N) | 0.85 mmhos/cm. |
Maximum solubility | 3.5 lbs./gal. |
Weight (oz.) of product needed to mix one gallon of concentrate
Target concentration (N/ppm) after dilution | EC (mmhos/cm.) of target feed rate after dilution | |||||
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Injector ratios | ||||||
1:15 | 1:100 | 1:128 | 1:200 | 1:300 | ||
25 | 0.2 | 1.6 | 2.1 | 3.2 | 4.8 | 0.21 |
50 | 0.5 | 3.2 | 4.1 | 6.4 | 9.6 | 0.43 |
75 | 0.7 | 4.8 | 6.2 | 9.6 | 14.5 | 0.64 |
100 | 1.0 | 6.4 | 8.2 | 12.9 | 19.3 | 0.85 |
125 | 1.2 | 8.0 | 10.3 | 16.1 | 24.1 | 1.06 |
150 | 1.4 | 9.6 | 12.3 | 19.3 | 28.9 | 1.28 |
175 | 1.7 | 11.3 | 14.4 | 22.5 | 33.8 | 1.49 |
200 | 1.9 | 12.9 | 16.5 | 25.7 | 38.6 | 1.70 |
250 | 2.4 | 16.1 | 20.6 | 32.2 | 48.2 | 2.13 |
300 | 2.9 | 19.3 | 24.7 | 38.6 | EMS | 2.55 |
350 | 3.4 | 22.5 | 28.8 | 45.0 | EMS | 2.98 |
400 | 3.9 | 25.7 | 32.9 | 51.4 | EMS | 3.40 |
450 | 4.3 | 28.9 | 37.0 | EMS | EMS | 3.83 |
500 | 4.8 | 32.2 | 41.2 | EMS | EMS | 4.25 |
600 | 5.8 | 38.6 | 49.4 | EMS | EMS | 5.10 |
Gallons of water needed to dissolve one 25 lb. bag of fertilizer
Target concentration (N/ppm) after dilution | EC (mmhos/cm.) of target feed rate after dilution | |||||
---|---|---|---|---|---|---|
Injector ratios | ||||||
1:15 | 1:100 | 1:128 | 1:200 | 1:300 | ||
25 | 1658.9 | 248.8 | 194.4 | 124.4 | 82.9 | 0.21 |
50 | 829.4 | 124.4 | 97.2 | 62.2 | 41.5 | 0.43 |
75 | 553.0 | 82.9 | 64.8 | 41.5 | 27.6 | 0.64 |
100 | 414.7 | 62.2 | 48.6 | 31.1 | 20.7 | 0.85 |
125 | 331.8 | 49.8 | 38.9 | 24.9 | 16.6 | 1.06 |
150 | 276.5 | 41.5 | 32.4 | 20.7 | 13.8 | 1.28 |
175 | 237.0 | 35.5 | 27.8 | 17.8 | 11.8 | 1.49 |
200 | 207.4 | 31.1 | 24.3 | 15.6 | 10.4 | 1.70 |
250 | 165.9 | 24.9 | 19.4 | 12.4 | 8.3 | 2.13 |
300 | 138.2 | 20.7 | 16.2 | 10.4 | EMS | 2.55 |
350 | 118.5 | 17.8 | 13.9 | 8.9 | EMS | 2.98 |
400 | 103.7 | 15.6 | 12.2 | 7.8 | EMS | 3.40 |
450 | 92.2 | 13.8 | 10.8 | EMS | EMS | 3.83 |
500 | 82.9 | 12.4 | 9.7 | EMS | EMS | 4.25 |
600 | 69.1 | 10.4 | 8.1 | EMS | EMS | 5.10 |
Brand details
This product is part of the Peters Excel pHLow portfolio
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The acidifying action of Excel pHLow stabilizes pH levels in all types of growing media.
Learn more about Peters Excel pHLow