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

🌱Optimized NPK 4-18-38 blend

💧100% water-soluble formula

⚖️Precise 1:1:0.5 mixing ratio

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₹ 6378

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Description

🌿 Master your garden’s growth with precision-packed power!

EFFORTLESS ABSORPTION - 100% water-soluble powders ensure rapid nutrient uptake
CUSTOMIZABLE BULK SIZING - Available from 1 lb to 62.5 lbs to fit your garden scale
TRUSTED BY EXPERTS WORLDWIDE - Used globally by horticulture pros for superior growth results
PRECISION PACKED FOR CONSISTENCY - Pre-measured 1/1/0.5 ratio bags eliminate guesswork
PROFESSIONAL GRADE NUTRIENT SYNERGY - Three perfectly balanced components for peak plant vitality

The MASTERBLEND 4-18-38 Complete Combo Kit is a professional-grade fertilizer set containing MasterBlend 4-18-38, Calcium Nitrate, and Epsom Salt in a precise 1:1:0.5 ratio. Fully water-soluble and designed for optimal nutrient uptake, this 2.5-pound kit supports vigorous plant growth and is trusted by growers worldwide. Packaged for easy mixing and available in bulk sizes, it’s the go-to solution for serious gardeners seeking consistent, high-performance results.

Specifications

ASIN	B072F2BL9D
Best Sellers Rank	#10,921 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #364 in Garden Fertilizers
Brand Name	MasterBlend
Coverage	Full
Customer Reviews	4.7 4.7 out of 5 stars (4,727)
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
Part Number	AACXZSG-119
Specific Uses For Product	Plant Growth
Target Species	Plants
Unit Count	1 Count

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