How often should I empty and replace my reservoir and nutrient solution starter hydroponic knowledge
By Matt LeBannister 26 February 2017
Reservoirs should be emptied and the nutrient solution replaced at least every 5-7 days.
Nutrients not entirely used by your plants may potentially increase toxic levels.
People often use their EC/TDS meters to measure nutrient levels and top up their nutrient solution when levels get low. EC/TDS meters only measure overall salt levels, not the levels of specific nutrients. This means nutrients not entirely used by your plants will begin to build up to potentially toxic levels.
Emptying your reservoir and replacing your nutrient solution with a quality fertilizer is the only way to ensure nutrient levels are consistently in the ideal range for plant growth.
Credits: Current Culture H2O (instagram)