Solids) you can understand how much of your
nutrients have been used up and how much more
you need to add to reach the optimal nutrient
level. All reservoirs will become unbalanced
and need replenishing. As a general rule, an
initial amount is used to fill the reservoir.
As the plants use up the solution, we top up
the reservoir to maintain the initial level.
If you start with 10 gallons of solution
then we need to top up to that total of 10
gallons every few days.
Figure 9.14 - Ppm reader (TDS meter).
