How often to water hydroponic plants with ebb and flow (flood and drain) systems largely depends on whether your using expanded clay pebbles, rockwool or coconut coir. These growing mediums do slightly effect optimal watering schedules, oxygenation and maximum nutrient uptake for cannabis plants root systems. Timing intervals are also strain specific.
Optimal Ebb And Flow Hydroponics Interval Schedule?
The best time range guideline for ebb and flow watering schedules is flooding at intervals of every 12 hours for seedlings, 3-4 hours during vegetative stage and every 2 hours during flowering. Never flood for more than 10 mins each cycle, and make sure reservoir fully drains to allow roots to oxygenate.