Is there a kit available that contains the master blend, and also the calcium nitrate and magnesium sulfate . sure would be nice .

Yes, sold in amazon and work great. Instructions on the bag and good price.

What the best way to adjust EC if its to low and you already mixed all 3 parts together

First, you should not mix the calcium nitrate together with the master blend and magnesium sulfate (EPSON salts) at the same time. Mix the master blend and EPSON salts together and mix the calcium nitrate separately before adding to your nutrient solution. When you mix all 3 together at the same time it binds up the nutrients and they can’t release properly. See if mixing them separately before adding helps.

Can this fertilizer be applied directly to container plants or must it only be used in a hydroponic system?

Container plants will love this. I top dress soil and water in. I also measure it in filtered water to apply. It's very good stuff.

Newby here, I have an organic container garden, are this supplements synthetic? I purchased this and not sure if I should use it.

Totally synthetic, so now what?

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🌿 Elevate Your Garden Game with MasterBlend!

EASY TO USE - Just mix with water and watch your garden flourish—no green thumb required!
HYDROPONIC HERO - Designed specifically for hydroponic systems, ensuring optimal nutrient delivery.
GROW LIKE A PRO - Unlock the secret to thriving tomatoes and veggies with MasterBlend's expert formulation.
TRACE MINERAL POWER - Packed with essential trace minerals for robust plant health and growth.
BULK OPTIONS FOR EVERY GARDENER - Choose the quantity that fits your gardening needs and never run out!

MasterBlend 4-18-38 Tomato & Vegetable Fertilizer is a world-renowned hydroponic solution available in bulk quantities of 1, 5, or 25 pounds. This super concentrated, 100% water-soluble fertilizer is specifically formulated for peppers and tomatoes, ensuring your plants receive all the essential trace minerals they need for optimal growth.