Mills Ultimate PK

Quick Answer

Mills Ultimate PK is a late-flowering PK additive for use within the Mills nutrient program. The official regular schedule introduces it from flowering week 5 for plants grown in coco, hydroponic systems or soil. Choose from 250mL, 500mL, 1L and 5L sizes.

Product Description

Mills Ultimate PK is designed for the final part of the flowering cycle. Its label analysis is 0-7-6, and Mills describes the formula as containing chelated essential micronutrients. It is intended to complement—not replace—the Mills base nutrient program. Follow the water-specific schedule below or the current product label rather than applying one universal rate.

Key Features

• Late-flower additive used from flowering week 5 in the regular Mills schedule
• 0-7-6 label analysis
• Chelated essential micronutrients
• Suitable for coco, hydroponic systems and soil
• Integrates with the Mills Vitalize, Basis A and Basis B feeding sequence
• Four bottle sizes for small grows through larger reservoirs

Available Sizes and Variants

• 250mL
• 500mL
• 1L
• 5L

Select the required size from the product options. Price and availability update with the selected variant.

Specifications

Package Contents

• 1 × Mills Ultimate PK bottle in the selected size

Directions for Use

1. Fill the reservoir with water.
2. Add Vitalize and mix, then add Basis A and Basis B separately and mix thoroughly.
3. Add Mills Ultimate PK at the appropriate water-specific feed-chart rate and mix again.
4. Add any other scheduled stimulant separately, then check and adjust pH. Mills lists a working pH range of 5.5–6.5.

Do not mix concentrated nutrients together before dilution. Always check the current label and official feed chart for the crop, system and water source.

Regular Tap-Water Schedule

• Flower weeks 5–6: 2mL per litre
• Flower weeks 7–8: 2.5mL per litre
• Flower week 9: 2mL per litre

Regular Reverse-Osmosis Water Schedule

• Flower weeks 5–6: 2mL per litre
• Flower weeks 7–8: 3.5mL per litre
• Flower week 9: 2mL per litre

Care, Storage and Safety

• Keep the container closed when not in use and store it upright in a cool, dry place.
• Use clean, accurately graduated measuring equipment.
• Do not premix nutrient concentrates; add each component to water separately and mix between additions.
• Keep out of reach of children and pets, and follow the current label instructions.

Buyer FAQs

What is Mills Ultimate PK used for?

It is a PK additive for the later part of flowering within the Mills nutrient program.

When should I start using it?

The official regular schedule introduces Ultimate PK in flowering week 5.

How much should I use?

The rate depends on the week and water source. Use 2mL/L in weeks 5–6; the weeks 7–8 rate is 2.5mL/L for tap water or 3.5mL/L for reverse-osmosis water; return to 2mL/L in week 9.

Can I use it in coco?

Yes. Mills lists coco, hydroponic systems and soil as compatible growing media.

Is Ultimate PK a complete base nutrient?

No. It is an additive used alongside the scheduled Mills base nutrients.

Can I premix it with other concentrated nutrients?

No. Add each concentrate separately to water and mix thoroughly between additions.

What pH should I target?

The Mills chart lists a working range of pH 5.5–6.5. Adjust only after all scheduled nutrients have been mixed.

Which size should I choose?

250mL and 500mL suit smaller programs, while 1L and 5L reduce repeat purchasing for larger or more frequent reservoir mixing.

Does it guarantee larger flowers or higher yield?

No outcome is guaranteed. Results depend on crop genetics, environment, irrigation, base nutrition and correct use.