Mills Feed Chart – Regular Line, Tap Water Doses

Mills Nutrients' own published Regular schedule for tap water. Week by week, in millilitres per litre.

Mills print four versions of this schedule and they are not interchangeable. Two are for the Regular bottles and two for the thicker High Concentrate bottles, and each of those comes in a tap-water and a reverse-osmosis version. So check the label on the bottle you own, then check what you are filling the tank with. This page is Regular on tap water, which is what most UK growers need. The other three are the Regular osmosis chart, the High Concentrate tap chart and the High Concentrate osmosis chart.

Mills Regular feed chartTap water · coco, hydro or soil · tap to enlarge

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• All dosesper 1 litre
• pH5.5 – 6.5
• Base feed1–4ml of each of A and B

Basis A and Basis B always go in at the same amount as each other. The week number starts again at 1 when flowering begins.

Every figure is millilitres per one litre of water, not per ten. A 10-litre watering can needs ten times these numbers, so 3.5ml of Basis A becomes 35ml. Get that wrong and the feed is ten times too weak.

Getting it right

• Read the dose as per litre. Most brands print per 10 litres, Mills print per litre. It is the single easiest mistake to make with this chart.
• This is the tap-water chart. Mills base it on water that already reads about EC 0.7, which is typical of UK mains. Through a reverse-osmosis filter the same bottles are dosed higher — that is the Regular osmosis chart.
• Regular is not the High Concentrate line. The labels carry the same product names but the liquid is a different strength, and the High Concentrate figures are roughly a third of these. Never run one line's numbers with the other line's bottles.
• One chart covers coco, hydro and soil. Mills say so themselves, which is unusual — most brands publish a separate schedule per medium. The medium changes how often you water, not how much goes in the tank.
• Mixing order matters. Vitalize goes into the water first, then Basis A, then Basis B in the same amount, then the stimulants. Never pour two concentrates together before they hit the water.
• Keep pH between 5.5 and 6.5 and expect EC to climb from about 1.3 in early growth to about 2.8 at peak bloom. Set the strength first, correct the pH after.
• Grow is only two weeks on this chart. If you veg for longer, hold the Grow 2 figures until you flip the lights, then start at Flower 1.

Everything on the chart

Common questions

Which of the four Mills charts do I need?

Two questions. First, are your bottles Regular or High Concentrate — it says so on the label. Second, is your water straight from the tap or through an RO filter. That gives you one chart of the four. This one is Regular on tap water; the others are the Regular osmosis chart, the High Concentrate tap chart and the High Concentrate osmosis chart.

Why are the tap doses lower than the osmosis ones?

Because tap water is not empty. It already carries calcium, magnesium and other salts, so Mills ask for less from the bottle. RO water has had all of that stripped out, so that chart puts more back in.

Does this really work in soil as well as coco and hydro?

Yes. Mills publish a single schedule and state it can be used on all mediums. What changes between them is watering frequency and how much runoff you aim for, not the amount of nutrient in the tank.

What does 3.5ml per litre mean in a watering can?

Multiply by however many litres the can holds. A 5-litre can takes 17.5ml, a 10-litre can takes 35ml. Measure the 0.1ml and 0.2ml Vitalize figures with a syringe.

Is there a chart for the organic bottles?

Yes, and it is a different line entirely. The Mills Organics feed chart covers Base, Grow, Cal and Bloom, with three grow weeks instead of two.

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Figures as published by Mills Nutrients on their own growth charts page, mills-nutrients.com. Always read the label on the bottle you own. Mills Nutrients is a trade mark of its owner.