How long a reservoir lasts and when to top it up.
Plant water demand is totaled daily, then the usable tank volume below the refill line is divided by that rate. Letting hydroponic water dive to near-empty shifts EC and pH hard, so a set refill point keeps solution stable.
Hydroponic Reservoir
Daily use = plants x each; days = refill level / daily use
Daily use = plants x each; days = refill level / daily use Plant water demand is totaled daily, then the usable tank volume below the refill line is divided by that rate.
Letting hydroponic water dive to near-empty shifts EC and pH hard, so a set refill point keeps solution stable.
This calculator takes 4 inputs: Tank size, Plants, Use per plant, Refill level. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.