Steve - thanks for the kind words. As I've mentioned to you before, YOUR work and style of documentation has inspired many - myself included.
I guess I never really thought about adding a check valve closer to the PVC unit because of the four I added slightly "upstream" to prevent the ferts from mixing up. I've never lost a JG connection - crap - I'd better knock on wood. I will see what adding one there will do to the back-pressure on the peristaltic pumps pushing the ferts into the tank. I'm a bit concerned about this already.
As far as the black rubber hose; nothing earth-shattering really. I figured the unit would be easier to clean if I could take it apart. If I used PVC, I would have had to cement it, because the T's weren't threaded on the ends.
Glad you had a chance to take a look!
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