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

€ 93.15

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Description

🌿 Elevate your grow game with MasterBlend’s precision nutrient trio!

EFFORTLESS UPTAKE - Fully water-soluble for rapid nutrient absorption
TRUSTED BY PROS WORLDWIDE - Used globally for consistent, lush plant results
TRIPLE COMPONENT PRECISION - Includes MasterBlend, Calcium Nitrate & Epsom Salt in perfect mix
BALANCED NUTRIENT POWERHOUSE - Optimized 4-18-38 NPK ratio for vigorous growth
VERSATILE HYDROPONIC CHAMPION - Ideal for hydroponics & Kratky method growers

The MASTERBLEND 4-18-38 Complete Combo Kit is a professional-grade, water-soluble fertilizer set containing MasterBlend, Calcium Nitrate, and Epsom Salt in a precise 1:1:0.5 ratio. Designed for hydroponics and soil-less growing methods, it delivers balanced nitrogen, phosphorus, potassium, calcium, and magnesium to maximize plant health and growth. Trusted worldwide, this 2.5-pound kit provides all essential nutrients in concentrated form for easy mixing and superior plant uptake.

Specifications

ASIN	B072F2BL9D
Best Sellers Rank	#8,789 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #321 in Garden Fertilizers
Brand Name	MasterBlend
Coverage	Full
Customer Reviews	4.7 4.7 out of 5 stars (4,736)
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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TrustScore 4.5 | 7,300+ reviews

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€ 93.15

Duties & taxes included

In stock

Sold byAmazon SpainDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

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TrustScore 4.5 | 7,300+ reviews

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