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 nutrient blend

💧100% water soluble formula

⚖️Precise 1:1:0.5 mixing ratio

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Description

🌿 Grow like a pro, feed like a boss!

BULK POWER PACK - 2.5 lbs kit covers multiple 5-gallon nutrient solutions—grow more, stress less
CLEAR CONVENIENT - Transparent packaging ensures you see exactly what you get—no surprises
PRECISION PERFECTED - Exact 12g MasterBlend, 12g Calcium Nitrate, 6g Epsom Salt ratio for optimal growth
PRO APPROVED FORMULA - Trusted by global horticulture experts for superior plant performance
EFFORTLESS ABSORPTION - 100% water soluble for rapid nutrient uptake and healthier plants

The MASTERBLEND 4-18-38 Complete Combo Kit is a professional-grade, water-soluble fertilizer blend containing MasterBlend 4-18-38, Calcium Nitrate, and Epsom Salt in a precise 1:1:0.5 ratio. Designed for optimal plant growth, this 2.5-pound kit supplies all essential nutrients for mixing 5-gallon batches of nutrient solution, trusted worldwide by horticulture professionals.

Specifications

ASIN	B072F2BL9D
Best Sellers Rank	#11,068 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #366 in Garden Fertilizers
Brand Name	MasterBlend
Coverage	Full
Customer Reviews	4.7 4.7 out of 5 stars (3,888)
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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Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

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