Aptus Liquid Base, 5 L

A Clean Foundation for Precision Feeding in High-Demand Cultivars, 5 L

Most base nutrients are formulated for broad compatibility, which means they include buffer compounds, secondary elements, and filler chemistry that can accumulate in the growing substrate over time and interfere with accurate EC or PPM readings. Aptus Liquid Base was formulated specifically to avoid this: every ingredient was chosen to supply the essential macro and micro elements plants need through both vegetative and flowering stages, without the additives that cause unnecessary substrate contamination.

Liquid Base ships in a 5 L container, sized for multi-room growers dosing a reservoir at 1-2 ml per liter.

Key Features & Benefits

• Dual-stage veg and flower formula — a single base nutrient that supplies essential macro and micro elements across both growth phases without requiring separate veg and bloom formulas.
• No substrate-contaminating additives — every ingredient was intentionally chosen to avoid compounds that accumulate in the growing medium and distort EC/PPM readings over time.
• No added calcium — calcium is deliberately excluded, requiring pairing with Massboost or Mineral-CalMag for accurate, independent Ca dosing.
• Accurate nutrient density readings — without contaminating additives, the EC meter reads only what the plant is actually receiving.
• Dosage 1-2 ml per liter — or 4-10 ml per gallon for standard feeding, a scalable foundation across garden sizes.

Who Should Use Aptus Liquid Base

Precision growers who want a clean base nutrient they can trust EC readings from, without the accumulating buffer chemistry that distorts substrate conditions over time, and who want independent control over their calcium source, with the 5 L size matched to reservoir scale.

About Aptus Liquid Base

Aptus Plant Tech began developing soil- and plant-science-based nutrient research in the Netherlands in the 1990s and has grown into a hydroponic nutrient supplier distributing across Europe, North America, and Australia. Liquid Base contains no added calcium by design; every program built around it must include either Massboost (at flower weeks 3, 5, and 7) or Mineral-CalMag (used throughout veg and flower) to supply Ca and Mg independently of the base dose.

Frequently Asked Questions

Why does Aptus Liquid Base contain no added calcium?

Calcium is excluded by design so it can be dosed independently through Massboost or Mineral-CalMag. This prevents the fixed Ca ratio in a two-part base from limiting your ability to adjust calcium and magnesium separately from the base nutrient.

What is the correct dosage for Liquid Base?

Regular feeding runs 1-2 ml per liter or 4-10 ml per gallon. This range accommodates different cultivars and stages, so start at the lower end and adjust based on EC readings.

How does Liquid Base support accurate EC readings through both veg and flower?

By excluding substrate-contaminating additives, the dissolved elements in the feed solution match exactly what the plant receives, so there's no background chemistry inflating the EC number. Because it runs as a single dual-stage formula, that accuracy holds from the start of veg through the end of flower.

Can Liquid Base be used throughout both vegetative and flowering stages?

Yes, it's formulated as a dual-stage base nutrient that runs continuously from the start of veg through the end of flower, pairing with bloom-specific additives as the cycle progresses. Growers don't need to switch to a separate bloom base at any point.