Olla Watering Calculator
Learn how your self watering olla releases water over time and why the flow rate decreases as the vessel empties.
How the Olla calculator works
Why flow rate decreases over time
An olla releases water through its porous terra cotta walls wherever water touches the clay. When full, maximum surface area is in contact, producing the highest seepage rate. As the water level drops, less clay surface is engaged, so the flow rate gradually declines.
How to read the chart
The blue curve shows actual remaining water volume — faster drop at the start, then a slower taper as the olla nears empty. The dashed line represents a constant-flow comparison. Plants receive more water early in the cycle and less later.
Average vs. Actual flow rate
Average flow rate = total capacity ÷ estimated days (linear approximation).
Actual flow rate = true seepage when the olla is completely full.
Soil dryness matters
Drier soil increases the moisture gradient, drawing water out faster. Adjust the slider to match current soil conditions for a more accurate watering estimate.
Treat this as an estimate
Actual performance varies with plant size, pot size, ambient temperature, airflow, soil mix, and how firmly the spike is seated in the soil. Refill when empty or when your plant shows signs of thirst.
How to Set Up Your Acqua Olla
Your Acqua Olla uses the natural properties of unglazed terra cotta to water plants gradually and efficiently. The porous clay walls allow water to seep slowly into the soil as it dries. Take a few minutes to read through the setup guide below — select each step to read the full instructions.
Setup Steps
Select an image to read the instructions for that step.
Tips for Best Results
Monitor Flow Rate
In the first week, check how quickly the water level drops. This helps you understand your plant's needs and optimise refill timing.
Soil Moisture Levels
Flow slows in moist soil. In dry soil, water is drawn out more quickly because dry soil has a higher capillary pull.
Clean Exposed Terra Cotta
If you notice slower flow over time, gently scrub the terra cotta with a coarse brush to remove dust, soil, or mineral buildup.
Flow Rate Will Slow
As water flows out and the surface area in contact with water reduces, the flow rate will decrease over time. This is normal.
Video Guides
Setup guides, demos, and plant care tips.