How often to change nutrient solution? | Hydroponics Halifax
There really isn’t any specific amount of time that should go by before you should change your nutrient solution so a good rule of thumb to follow is this. First of all you should regularly top up your reservoir with fresh plain water and adjust the pH.
This is because you will lose water to evaporation and plant transpiration but the strength of the solution does not necessarily drop along with the level of the water. So, in some cases as the reservoir water level drops the solution concentration actually goes up or gets stronger.
So, add only fresh water and then adjust your pH accordingly. Try and keep a record of how much water you are putting in the reservoir to top it off and once the amount of water added equals half of the reservoir capacity it’s time to change the solution and rinse the reservoir.
For example if you have a 20 gallon reservoir and over the course of 12 days you have added 10 gallons of water, then it is time to change your solution.
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