Mills Nutrients - Ultimate PK

MILLSSKU: 762270

Size: 1 Litre
Sale price£52.49

Ultimate PK Gives You Bigger and Better Fruits

Ultimate PK is a heavyweight PK booster that contains high levels of phosphorus and potassium - two crucial macronutrients that are required in greater quantities during the bloom phase. When used in the last 2-4 weeks of the bloom cycle, this booster will enhance fruit quality and yield, while maintaining root health.

How Ultimate PK Works

Mills Ultimate PK uses clean and super soluble mineral salts, that are less likely to leave residues and cause blockages. This makes Ultimate PK a great choice for pretty much any growing medium or grow system, whether you're using soil, coco or hydroponic media. These minerals are also highly available to plants, which helps to ensure that as much phosphorus and potassium is uptaken as possible, at a time when plants depend on it. This all leads to incredible fruit production, which is why Ultimate PK (along with the rest of the Mills range) is so popular.

Use C4 (another PK booster) from week three to week six. Use Ultimate PK from week six onwards and stop at the final flush. See the feed chart in the downloads section for more information.



Your choice of size of Ultimate PK (choose your size above)


  • Gives plants the extra phosphorus and potassium they demand in peak flower (0-7-6)
  • Allows plants to reach their full potential in bloom
  • Contains clean, highly soluble mineral salts
  • Helps to push yields as far as possible while improving fruit quality
  • Enhances essential oil production, for better flavours and aromas
  • Extremely potent - not to be used alongside other PK boosters
  • Available in three sizes: 250ml, 1 litre and 5 litre

How To Use

How to Use Mills Ultimate PK

Ultimate PK is to be used in the last 2-4 weeks of flowering, at 2ml per litre. As always, add one nutrient or additive at a time and stir thoroughly before adding the next product.

It must be kept at room temperature, and make sure that you do not allow it to freeze or else it you will ruin the booster’s effectiveness.

Ultimate PK must be kept out of reach of children, and is harmful if it comes into contact with your eyes. Avoid ingesting or breathing in the product, as it could be corrosive and harmful to your health if swallowed. Avoid direct heat, fire, or contact with your skin, as prolonged exposure could cause irritation.

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