I’m a novice, but it seems odd that the water needs to be changed every 7 days. I’m using distilled water. Perhaps you could explain the chemistry behind this requirement?
The idea behind changing your water every week is to ensure that your plant has less of a chance of getting root rot and also ensures you are always feeding fresh nutrient solution to your plants. When growing in a DWC system, it is important to completely change out the nutrient solution.
Think of it through this analogy (@Stephen gets the credit for teaching me it in the first place ): every week I go out and buy fresh bananas, oranges, and apples for my kids. When I get home I place them all in piles on the kitchen table for them to eat; however, at this point I cannot see what’s left on the table anymore. Depending on what the kids are feeling that week they’ll eat a random combination of the fruits, or even might munch down on only one of the groups of fruits. So, the next week when I do my grocery run I end up buying the same amount of each fruit. The only difference this week is that I’ll clear the entire table before putting the new fruits on the table to make sure that there’s nothing rotting, which could potentially poison the kids. It’s the same way with the nutrients we’re giving to your plants; if we were to keep dosing the same amount of nutrients every week without cleaning the water first, we could potentially poison the plant with an excess of any of the nutrients
Hope that helped
Well put my friend. Excellent analogy!!!
I was notified to do the first drain and fill today. My seed hasn’t sprouted but does have a small root. Should I still do the recommended water change or wait until I see the seed sprouting?
Yup, do it. Replenishes with fresh nutes and water.
Yes always do what it says!
@rouleauj even if my plant hasn’t started growing? I’d think maybe we would want to delay as the notifications have nothing to do with what is actually going on inside the grobo
Do it even if it hasn’t sprouted. The tap root showing it’s lovely head is a great sign. It needs nutrients and fresh water.
What day?..I figure day 7 as you just got your drain and fill notification. A bean can take up to 10+ days to sprout before you might need to chuck her. As you have a tap root already observed, the nutes dispensed after said drain and fill will ultimately help your girl sprout quickly now. Genetics and feeding schedule will determine how she grows now. Be patient. And keep us posted.
As everyone already mentioned here @Gatorsfn28 it’s best to follow the drain/fill schedule to make sure that your plant has the potential to do its best