I would prefer to use black vinyl tubing for the AP systems I am building for sale. It makes setting up the the AP systems much more flexible and easier than using PVC.
Is there a good reason not to use it?
I also prefer to use screw type brass valves. They make adjusting the flow to grow beds easier and more precise.
With the discussion of copper pipes causing copper in the water I was wondering if the valves would leach enough copper or whatever into the water to cause harm.
What are you thoughts on these items?