🎬 Free course

Your Water – The First Ingredient

Every watering can carries an invisible cargo: carbonate that acts like a small dose of lime, calcium and magnesium that disappear along with everything else in reverse osmosis, possibly a disinfectant – and with rainwater, whatever the roof adds. Four lessons about the ingredient that comes before the first millilitre of fertiliser.

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Registered users only

This course is free – all you need is an account.

The Silent Dose of Lime

It isn't the pH of your water that decides where your substrate pH drifts over weeks – carbonate hardness does.

Zero Is a Number Too

RO water isn't perfect water, it's empty water – it solves the carbonate problem and takes calcium and magnesium with it.

The Invisible Disinfectant

Chlorine and chloramine are two different substances with two different outcomes – and the best-known kitchen trick only works on one of them.

Water From the Sky

Rainwater isn't automatically the purest water – its quality is decided on the roof and in the tank.