Thansk but, 1st off, I have pumps from 110gph to 600gph...
2nd you didn't read thread very well because drains are plastic...
and system is not over a bathtub, that was just for a month because of space. It does not leak.

I don't do grow threads anymore, veggies only, I have nothing to prove.

If you ever doubt that any of my DIY systems work...Well, I have this to say If you know what you are doing then you can grow anything you want in any kind of hydro system. I can! peace