Is this product water soluable

Yes it is. It is very soluable. I reccomended running it at these ragione. Part A : 3g/gallon Part B : 2g/ gallon Epsom Salt: 1g/gallon And if you are using RO water, add 5ml/gallon Calimagic to this mix. It works fangastic.

Do I need to add something to this if I am growing tomatoes (kratky method of hydroponics)?

Yes, calcium nitrate must be dissolved separately. It is also called Jack's part B, or 15-0-0 (Ca-19%), use a greenhouse brand like jacks, Powergrow, or Yara. I have found the super cheap brands (eg southernAG, highYield) may be coated with insoluble goop, or otherwise contaminated. The two parts must be diluted before mixing or the calcium and sulfur will form gypsum and gypsum is only mildly soluble so can settle out of a concentrate and is then very hard to redissolve.

can it be used in soil? If so at what rate?

Absolutely...same rate as hydro is fine. If your using it for canna I increase slowly and like keeping it under 1000ppm cus I use dry amendments as well. Jack's also has a line of boosters

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Jack's Nutrients 5-12-26 Hydroponic Professional Fertilizer Part A, 25lb

Jack's Nutrients 5-12-26 Hydroponic Professional Fertilizer Part A, 25lb

Product ID: 67861012

Details

Brand
Jack's Classic
Item Form
Powder
Item Weight
25 pounds
Liquid Volume
500 ml
Specific Uses For Product
Hydroponic

🌱Micronutrients for optimal plant health

💧Water-soluble powder for easy mixing

⚖️5-12-26 precise nutrient ratio

B/.575

Duties & taxes included

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Description

🌿 Feed your future: Grow smarter, not harder with Jack’s Nutrients!

TRUSTED PROVEN - Highly rated by professionals with 4.8 stars and top ranks in garden fertilizers.
EFFORTLESS MIXING - Water-soluble powder lets you create gallons of nutrient-rich solution with ease.
HYDROPONIC OPTIMIZED - Designed specifically for continuous liquid feed systems in controlled environments.
ALL IN ONE MICRONUTRIENTS - No extra feeding needed—complete nutrition for thriving hydroponic crops.
PRECISION NUTRIENT BALANCE - Tailored 5-12-26 formula fuels vigorous leaf growth and robust roots.

Jack's Nutrients 5-12-26 Hydroponic Professional Fertilizer Part A is a 25lb water-soluble powder designed for hydroponic systems, delivering a precise balance of macro and micronutrients to promote strong roots and lush leaf growth. Trusted by professionals, it simplifies feeding with clear mixing instructions and complete nutrition in one formula.

Specifications

ASIN	B07CWXTJ6X
Best Sellers Rank	#72,496 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #1,632 in Garden Fertilizers
Brand Name	Jack's Classic
Coverage	Full
Customer Reviews	4.8 4.8 out of 5 stars (390)
Item Form	Powder
Item Type Name	Fertilizer
Item Weight	25 pounds
Liquid Volume	500 ml
Manufacturer	JR Peters
Model Number	79030
Number of Items	1
Part Number	79030
Specific Uses For Product	Hydroponic
Target Species	Greenhouse and Controlled Environment crops
UPC	671341790303
Unit Count	400 Ounce

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