Description
In stock now. Designed to be the most effective Cal-Mag product on the market.
IONIC Tonic delivers calcium in three forms, including chelated for a rapid dose, with chelated iron to drive chlorophyll production. L-form amino acids aid recovery to full health, and seaweed extracts work against stress with natural growth enhancers.
Use alongside any base feed. Unlike the base Grow and Bloom feeds, Tonic isn't a full nutrient on its own — it's a top-up, dosed differently depending on your growing medium and water type.
Key features
- Calcium in three forms, including chelated
- Chelated iron for chlorophyll production
- L-form amino acids that aid recovery
- Seaweed extracts against stress
- Dilution / Dose
- 0.5ml/L in soil and standard hydro; 1ml/L in coco; 0.5ml/L for one week only on hard water, where needed.
- When To Use
- Weeks 6–10 in soil/hydro; weeks 3–10 in coco; hard water only if a deficiency shows
- Substrate Fit
- Works alongside every IONIC base feed — Soil Grow, Soil Bloom, Hydro Grow, Hydro Bloom, Hard Water Grow, Hard Water Bloom, Coco Grow and Coco Bloom.
- Grower Notes
- Coco growers should treat Tonic as routine from week 3, since coco is inert and doesn't hold calcium and magnesium the way soil does. Hard water growers should only add it where a deficiency actually shows — the Hard Water range is already built to handle hard water's own mineral content.
How Tonic is used, by medium
| Medium | How it's used |
|---|---|
| Soil & Hydro (soft/RO water) | 0.5ml/L, weeks 6–10 of the flowering schedule, as a routine top-up. |
| Coco | 1ml/L, weeks 3–10 — routine use from early veg right through peak flowering, since coco needs it more consistently. |
| Hard Water | Not on the routine schedule. Use only where a recognised deficiency shows, at 0.5ml/L for one week. |
Good practice
- Add products to the water one at a time, stirring between each. Never mix concentrates neat.
- Keep any stored solution covered — light in stored solution eventually means algae.
- Measure every dose — eyeballing is where most feed problems start.
The Ionic Range
IONIC is one system, twelve products — a dedicated Grow and Bloom feed for each growing medium, plus four boosters used across all of them. Here's the full range:
FAQs
Do I need Tonic with every IONIC feed?
Not always. It's a routine part of the coco schedule and the mid-flowering weeks in soil and standard hydro, but on hard water it's only needed if you see a deficiency.
What does Tonic actually contain?
Calcium in three forms, including chelated for a rapid dose, plus chelated iron, L-form amino acids and seaweed extract — it restores vigour and corrects the deficiencies that show up as yellowing or interveinal chlorosis.
Can I use Tonic with any other nutrient brand?
It's formulated to complement the IONIC range specifically — for best results, pair it with Soil Grow, Hydro Grow or Coco Grow and their Bloom equivalents.
How much of this will your grow actually need?
Tell us your medium, pot size and plant count. The Feed Chart Calculator builds your week‑by‑week chart with target EC, works out every bottle for the whole run, and puts them straight in your basket.
