Can I make the system flood slowly enough?

[guy]

Dear Ron,
I'm the guy who wrote from Argentina a while back. I know you recommended that I forget the whole prospect of the 11 plant garden, but I was able to build it successfuly. It turned out great with 1 1/2" PVC (which in Argentina I think is similar in internal diameter to US 1"). I got the bottle caps to fit and seal in each PVC opening perfectly and I installed a flow control valve at the entry point into the system. My question is this: is a 200-300 gph pump (the smallest I could find) still too powerful, even with the flow control valve? Can I make the system flood slowly enough? Or do I really have to wait until my next trip to the states to get a smaller pump?
Ideally, I need to get these Amsterdam babies germinated before Christmas... I'm anxious. I don't want to wait until that next trip to the US.
Please help. Thanks a million.