If you do not have a reader you can still
grow a good crop, but it takes practice to get
it right. If a cannabis hydroponics grower does
not have a ppm reader, then they tend to
replace the reservoir more often instead of
topping it up. That way the grower is certain
that the new solution will contain everything
the plant needs. If you have a ppm reader then
you only need to top off the reservoir as
needed. PPM (parts per millionth) readers can
be expensive, but over time they will help you
save money on the cost of hydroponics
nutrients.
HYDROPONICS GROWING MEDIUMS
There are many hydroponics mediums to use
that your plant will take root in. Rockwool
appears to be the most popular and comes in
either slabs or cubes. These cubes vary in
sizes from 1" to 6" cubes. The slabs can be cut
to suite the shape of your pot or container.
Rockwool:
Many growers like to use the cubes for seed
germination and for rooting cuttings. This
