Jack's Nutrients 15-5-20 Tap Water Fertilizer | 2.2lb

Fertilizer Formulated for Alkaline Tap and Well Water, 15-5-20, 2.2lb

Alkaline tap, city, or well water can push a growing media's pH in the wrong direction over an extended feeding program. Jack's Nutrients 15-5-20 Tap Water Fertilizer is specifically formulated for those alkaline water types, with a potentially acidic profile designed to lower pH over time.

2.2lb size, 15-5-20 formula built for alkaline tap and well water.

Key Features & Benefits

• Formulated specifically for alkaline tap, city, or well water — designed to counter the mineral profile of those water sources.
• Potentially acidic formula, lowers pH over time — offsets the alkalinity common in tap, city, and well water.
• Extra soluble calcium, magnesium, and right-balanced micronutrients — complete one-part nutrition alongside the acidifying effect.
• Promotes leaf growth and strong roots — one-part system providing all macro, secondary, and micronutrients.

Who Should Use This Tap Water Formula

This fits growers feeding with alkaline tap, city, or well water who want a formula built to counter that water chemistry rather than work against it.

About Feeding with Alkaline Tap Water

Tap, city, and well water often run alkaline, so JR Peters built this Tap Water formula with a potentially acidic profile designed to lower pH over time, alongside extra soluble calcium and magnesium for complete nutrition.

Frequently Asked Questions

Why does tap or well water need a specific fertilizer formula?

Tap, city, and well water are often alkaline, which can work against a standard fertilizer's intended pH range over time. This formula is specifically formulated for alkaline tap, city, or well water types, with a potentially acidic profile designed to lower pH over time as it's used.

How is this different from the RO Pure Water formula?

This Tap Water formula is built for water that already carries dissolved minerals and tends toward alkalinity, while the RO Pure Water formula is built for water that's had nearly all its minerals stripped out. Choosing the right one depends on which water source a grower is actually feeding with.

Does this formula still include calcium and magnesium?

Yes, even though it's designed to lower pH over time, it doesn't skip the extra soluble calcium and magnesium, plus the right amount of micronutrients, needed for complete one-part nutrition. Promoting the growth of leaves and strong roots depends on that full nutrient package, not just the acidifying effect.

What size is this listing?

This is the 2.2lb size option. Both sizes share the same 15-5-20 Tap Water formula, so the choice comes down to how much product a grower needs on hand.