Jack's 15-5-20 Tap
Best all-in-one fertilizer for growers using tap or well water.
Jack's 15-5-20 Tap is a complete, single-part nutrient solution designed for growers using tap, city, or well water. It effectively addresses high pH and alkalinity, providing all essential macro, secondary, and micro nutrients in one easy application. This formula includes extra soluble calcium and magnesium, working to lower pH over time for optimal plant health. Simplify your feeding routine and promote robust growth with this efficient, quick-release nutrient delivery system.
$65.00
Owner Satisfaction
4.7
/ 5
Category Rank
50
/ 4425
#50 in Fertilizers
Price vs Category Average
+5%
Above average
NPK Ratio
15520
/ --
Who it's for
- Gardeners wanting a versatile feed for vegetative and flowering stages
- Municipal water users seeking simplified nutrient management
- Commercial growers prioritizing clean, clog-free irrigation systems
Who should skip it
- Reverse osmosis users needing a complete, all-in-one solution
- Advanced growers requiring precise, stage-specific nutrient ratios
- Small-scale hobbyists preferring the convenience of liquid concentrates
Performance breakdown
Water Compatibility
Engineered specifically to neutralize alkalinity in standard tap and well water.
Feeding Simplicity
Single-part formula eliminates the complexity of mixing multiple nutrient bottles.
pH Buffering
Actively stabilizes nutrient solution pH to prevent common lockout issues.
Nutrient Completeness
Delivers a comprehensive profile including essential calcium and magnesium supplements.
Solubility Speed
Quick-release powder dissolves rapidly for immediate plant uptake and absorption.
Growth Efficiency
Optimized NPK ratio promotes robust development throughout the entire vegetative cycle.
Key Specs
NPK Ratio
15-5-20
Nitrogen Percentage
15%
Phosphorus Percentage
5%
Potassium Percentage
20%
Package Weight
25 lb
Nutrient System
One-part formula
Fertilizer Form
Water Soluble Powder
Secondary Nutrients
Soluble calcium, magnesium
Features
- Corrects high pH and alkalinity
- Provides complete macro, secondary, and micro nutrients
- Simplifies feeding with a single-part system
- Includes extra soluble calcium and magnesium
- Optimized for common water sources
- Quick release nutrient delivery
- Buffering capabilities for tap water
What customers say
Customers highly value Jack's 15 5 20 Tap for its outstanding quality and dependable performance in specialized growing. Reviewers consistently note the formula's effectiveness, observing robust plant growth and reliable yields across different crops. A key benefit is the straightforward application; users appreciate the simple mixing and dosing process, which simplifies complex nutrient management. This blend of high efficacy and user friendly design makes the Tap a trusted, high value staple for serious cultivators who demand predictable outcomes.
Know before you buy
Yes, this formula is specifically engineered for well, city, and tap water sources. It is designed to buffer high alkalinity and pH levels, making it an ideal choice for growers dealing with hard or problematic water.
No, this is a complete, single-part nutrient solution. It already includes extra soluble calcium and magnesium, so you do not need to add separate supplements to your feeding regimen.
A single-part system combines all essential macro, secondary, and micro nutrients into one water-soluble powder. This simplifies your mixing process by eliminating the need to measure and balance multiple different bottles or bags.
With an NPK ratio of 15-5-20, this formula is balanced to provide consistent, quick-release nutrition. While it is excellent for general growth and maintenance, you should monitor your plants' specific needs as they transition between vegetative and flowering stages.
Yes, the formula includes specific buffering capabilities that work to lower and stabilize pH over time. This helps ensure your plants can effectively absorb the nutrients provided.
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Ask Hayley anything about this product before you decide.
Ready to buy?
$65