- Fill a large volume canister (100 to 200L) with water, ideally from a rainfall or a low calcareous source.
- Add the baking soda at a rate of 1kg/100liters of water.
- Add the sea salt at a rate of 500g/100litres of water.
- Shake well to dissolve them
- Transfer the volume of the canister into the culture basin with a pump (aquarium type or natural siphon). Repeat the operation until the tank is full.
- Make a mark 20 cm from the bottom to see if the water evaporates and top up with water if necessary.
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