Although it may seem like a mundane topic, the net pots that you choose can substantially affect your results. This article draws from an earlier post in the journal, where the topic was originally discussed.
All net pots are not created equal. In this article, we will discuss the differences between two of the most common brands: Botanicare and General Hydroponics. Typically, both of these brands are readily available in growing shops all over the country. I apologize to our international visitors, but I have no reference beyond my own familiar borders.
Example #1: Botanicare 3" Net Pot
Example #2: General Hydroponics Net Pot
As you can see from the photos above, there are some striking
differences. The pot made by General Hydroponics is roughly cast, with
lots of imperfections and "tags". Additionally, it's netting is much
"looser". This forces you to use a larger breed of hydroton when using
them for planting. This is an important distinction. The tighter mesh of the Botanicare net pot will allow you to use smaller bead hydroton. Smaller hydroton is important if you're working with aeroponics, as it helps to contain the water being sprayed on the pot.
The Botanicare pots are better item. Additionally, take note of the solid "ring" around the top of
the Botanicare pot... This ring is extremely important
if you're building your own system. The pot is designed in such a way
that it will sit cleanly in a 2 3/4" hole. This matters a lot, as it
will give you a clean and tight seal. This keeps your water in the
reservoir, and off your floor. The "ring" at the top forms a tight
"cork" in the hole. It fits well. Highly recommended.
It's easy to
make exact 2 3/4" holes with a hole saw. You don't even need an
expensive hole-saw. Plastic is soft, so expensive carbide hole-saws
are unnecessary. Buy the cheap high speed steel ones if possible. I
think I spent $11 for mine. Money well spent.
It's much more difficult to get a good seal using the General Hydroponics net pots. I suppose that they would work well in a less "aggressive" system, such as an ebb & flow. However, since I focus on aeroponics, I have found the Botanicare net pots to be a superior choice.