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.

Masterblend 4 18 38 Complete Combo Kit Fertilizer Bulk 2

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Description

🌱 Unlock your plants’ full potential with the ultimate nutrient trifecta!

PRO GRADE BULK KIT - 2.5 lbs packed by weight for long-lasting, consistent feeding cycles
EFFORTLESS ABSORPTION - 100% water soluble formula ensures rapid nutrient uptake and zero residue
VERSATILE HYDROPONIC POWERHOUSE - Optimized for both aerated systems and Kratky method—grow anywhere, anytime
TRUSTED BY EXPERTS INFLUENCERS - Top-rated by hydroponic pros and YouTube growers alike—join the elite green thumbs
PRECISION ENGINEERED NUTRIENT TRIO - MasterBlend, Calcium Nitrate & Epsom Salt perfectly balanced for peak plant health

The MASTERBLEND 4-18-38 Complete Combo Kit is a professional-grade, water-soluble fertilizer system combining MasterBlend, Calcium Nitrate, and Epsom Salt in a precise 1:1:0.5 ratio. Designed for hydroponics and soil-less growing methods, this 2.5-pound bulk kit delivers balanced nitrogen, phosphorus, potassium, calcium, and magnesium to maximize plant growth and yield. Trusted worldwide and highly rated, it’s the go-to solution for millennial growers seeking efficient, scalable, and proven nutrient performance.

Specifications

ASIN	B072F2BL9D
Best Sellers Rank	#8,605 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #341 in Garden Fertilizers
Brand	MasterBlend
Brand Name	MasterBlend
Coverage	Full
Customer Reviews	4.7 out of 5 stars 4,735 Reviews
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

Reviews

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14.06.2023

S**E

19.12.2025

A**A

1.02.2026

A**R

21.12.2025

C**D

8.01.2026

F**5

16.04.2026

D**D

29.09.2025

E**N

1.01.2026

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