I am planting lettuce using hydroponic, my tank is 70liters , what is the mixture for lettuce for my size of tank

The common formula seems to be 10G + 10G + 5G in 5 gallons of water for lettuce. 70 liters = about 18.5 gallons. I'll just make my math 18.5 gallons divided by 5 gallons = 3.7 So it would be 37G + 37G + 18.5G . I imagine most people would say 2G + 2G + 1G per gallon. 70 liters = 18.5 gallons, so once again the answer is 37G of Calcium + 37 of Masterblend + 18.5G of Epsom salt.

How long would the 25 pound kit last for a average hydroponics user? Many years? Any examples from your guy's own experience?

Yes for me it will last years I have 2 55 gallon drums with a cucumber and watermelon plant in each. And 10 5 gallon buckets with a mix of cucumbers tomatoes and peppers. 2 plants in each I will not put anything with cucumbers next year they drink too much. And two 7 gallon seed starting tubs. Anyway I could do this for years. On the amount I have and I mixed up 20 or so gallons for other people.

Does this generally tend to raise or lower pH?

Lowers the ph . If I use my tap water which is about 8.3 it ends up perfect at 5.6 to 5.9 . If I use rain water which is closer to 7 it ends up a tad too low so I add ph up.

May I use this fertilizer for chili pepper plants growing in the ground?

Yes you can. I made a batch of this solution and used it on peppers in the garden and I had the most bountiful harvest of peppers possible.

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MASTERBLEND 4-18-38 Complete Combo Kit Fertilizer Bulk (2.5 Pound Kit)

MASTERBLEND 4-18-38 Complete Combo Kit Fertilizer Bulk (2.5 Pound Kit)

Product ID: 42223037

Details

Brand
MasterBlend
Item Form
Powder
Item Weight
10 pounds
Liquid Volume
5 liters
Specific Uses For Product
Plant Growth

🌱Professional-grade plant growth boost

💧100% water soluble formula

⚖️Precise 1:1:0.5 nutrient ratio

C$4664

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Description

🌿 Elevate your garden game with the pro’s secret nutrient blend!

COMPLETE 3 COMPONENT KIT - Includes MasterBlend, Calcium Nitrate, and Epsom Salt for all-in-one plant nutrition
EFFORTLESS MIXING UPTAKE - Fully water-soluble powders ensure rapid nutrient absorption and hassle-free use
BALANCED NUTRIENT POWERHOUSE - Optimized 4-18-38 NPK ratio fuels vigorous growth and lush greenery
TRUSTED BY PROS ENTHUSIASTS - Globally used formula with 4.8-star rating and thousands of rave reviews
VERSATILE HYDROPONIC SOIL USE - Perfect for hydroponics, Kratky method, or traditional gardening setups

The MASTERBLEND 4-18-38 Complete Combo Kit is a professional-grade, water-soluble fertilizer system containing three precisely measured components—MasterBlend, Calcium Nitrate, and Epsom Salt—in a 1:1:0.5 ratio. Designed for optimal nutrient uptake, it supports vigorous plant growth across hydroponic, Kratky, and soil-based methods. Trusted worldwide and highly rated, this 2.5-pound kit delivers all essential macro and secondary nutrients in one convenient package.

Specifications

ASIN	B072F2BL9D
Best Sellers Rank	#8,053 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #262 in Garden Fertilizers
Brand Name	MasterBlend
Coverage	Full
Customer Reviews	4.8 4.8 out of 5 stars (4,782)
Item Form	Powder
Item Weight	10 pounds
Liquid Volume	5 liters
Manufacturer	MasterBlend
Mixing Ratio	1:1:0.5
Model Number	MASTERBLEND-COMBO_2.5LB-KIT
Number of Packs	1
Part Number	AACXZSG-119
Specific Uses For Product	Plant Growth
Target Species	Plants
Unit Count	1 Count

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