Jack's Professional Epsom Salt | 2.2lb

Magnesium Sulfate for the Jack's 3-2-1 Hydroponic System, 2.2lb

A three-part hydroponic feeding system depends on every component going into the reservoir in the right order. Jack's Professional Epsom Salt, a magnesium sulfate product, is an essential item to the Jack's 3-2-1 program, mixed second in the sequence after Part A and before Part B.

2.2lb size, magnesium sulfate, second in the 3-2-1 mixing order.

Key Features & Benefits

• Magnesium sulfate (Epsom Salt) — the second-mixed component in the Jack's 3-2-1 hydroponic feeding system.
• Essential item to the Jack's 3-2-1 program — supplies magnesium and sulfur alongside Part A and Part B.
• Mixed in a specific sequence — manufacturer guidance: after Part A, before Part B, to avoid reservoir precipitation.
• Water-soluble, standard-grade Epsom Salt — straightforward addition to an existing hydroponic feeding routine.

Who Should Use Jack's Professional Epsom Salt

This fits growers running JR Peters' Jack's 3-2-1 hydroponic feeding system who need the magnesium sulfate component to complete the sequence alongside Part A and Part B.

About the Role of Epsom Salt in the 3-2-1 Program

JR Peters' own mixing guidance for the Jack's 3-2-1 program is to mix Part A first, then Epsom Salts, then Part B last, a specific sequence designed to keep every nutrient available in solution rather than precipitating out.

Frequently Asked Questions

What part does this play in the Jack's 3-2-1 formula?

Magnesium Sulfate, or Epsom Salt, is an essential item to the Jack's 3-2-1 program, mixed second in the sequence after Part A FeED and before Part B Calcium Nitrate. JR Peters' own guidance is specific about that order: mix Part A first, then Epsom Salts, then Part B last, to avoid precipitation in the reservoir.

How and when should this be mixed into the reservoir?

Add it second in the sequence, after Part A and before Part B, since adding ingredients out of order in a multi-part hydroponic system can cause certain nutrients to precipitate out of solution rather than staying available to the plant. Epsom Salt's position in the middle of that sequence is specifically meant to prevent that.

Can this be used outside the 3-2-1 system?

This listing is positioned as an essential item to the Jack's 3-2-1 program specifically, so it's intended to pair with Part A and Part B rather than serve as a standalone magnesium supplement. Growers running a different feeding program should confirm compatibility before substituting it in.

What size is this listing?

This is the 2.2lb size option. Both sizes serve the same role as the Epsom Salt component of the Jack's 3-2-1 program, so the choice comes down to how much product a grower needs on hand.