Jack's Nutrients 12-4-16 RO Pure Water Fertilizer | 25lb

Fertilizer Formulated for RO and Pure Water Systems, 12-4-16, 25lb

Reverse osmosis and pure water systems strip out the minerals a fertilizer program often relies on the water source to help provide. Jack's Nutrients 12-4-16 RO Pure Water Fertilizer supports nutrient uptake in pure and reverse osmosis waters, replacing the calcium and magnesium those water types are naturally missing.

25lb size, 12-4-16 formula built for RO and pure water.

Key Features & Benefits

• Formulated specifically for pure and RO water — replaces nutrients missing from reverse osmosis and pure water types.
• 7% calcium and 2% soluble magnesium included — supplements minerals RO and pure water naturally lack.
• Highly soluble NPK plus enhanced micronutrient package — complete nutrition where the water source contributes little on its own.
• Part of JR Peters' greenhouse and CEA-focused Jack's Nutrients line — matched to water-chemistry-specific formulas across the same product family.

Who Should Use This RO Pure Water Formula

This fits growers running reverse osmosis or other pure water filtration systems who need a formula that replaces the minerals the water source no longer contributes.

About Feeding with Pure and RO Water

Reverse osmosis and pure water filtration remove nearly all dissolved minerals, so JR Peters built this RO Pure Water formula with added calcium and magnesium specifically to replace what pure and RO water no longer contribute.

Frequently Asked Questions

Why does RO or pure water need a special fertilizer formula?

Reverse osmosis and pure water filtration strip out the naturally occurring minerals that tap or well water would otherwise contribute, so a standard fertilizer formula can leave gaps in calcium and magnesium. This formula is designed to provide a highly soluble NPK plus an enhanced micronutrient package along with 7% calcium and 2% soluble magnesium specifically to fill that gap.

How is this different from a formula built for tap water?

This formula is designed around water sources that contribute essentially no minerals, so it supplies calcium and magnesium the water itself doesn't provide. A tap-water formula, by contrast, is typically built to work with the minerals already present in city or well water.

What nutrient uptake benefit does this formula target?

It's designed to support nutrient uptake in pure and reverse osmosis waters specifically, since those water types can behave differently from mineral-bearing water when it comes to how plants take up dissolved nutrients. That's the core reason this formula exists as a distinct product from a general-purpose feed.

What size is this listing?

This is the 25lb size option. Both sizes share the same 12-4-16 RO Pure Water formula, so the choice comes down to how much product a grower needs on hand.