Change the whole solution on a regular schedule, and sooner if it smells, turns cloudy or grows algae. Between changes, top up with fresh water as the plants drink.
Why Solution Goes Off
Plants take up nutrients unevenly, so the balance in the reservoir shifts over time. Warm water and light exposure also encourage algae and bacteria.
Practical Routine
- Check the level and pH regularly, and top up with plain water or a fresh mix as needed.
- Replace the full solution on a set schedule that fits the crop and the size of the reservoir.
- Clean the reservoir when you change the solution, then mix fresh.
Related guide: Nutrients.
