Sean,

Thanks for you comments. I appreciate your willingness to be part of this discussion.

I just finished sending a new email to your office because of another issue, but back on this topic....

Yes, I also believe that the new added bypass could help increase the chlorine level in the spa. If I find I do not have the correct flow, can I change the spring in the flow valve --- I asume you're talking about the flow control valve in the SC-36 manifold? And if I can, where do I get a different spring, or is it more a matter of stretching the current one? Finally, I don't see any why to get inside that flow valve. Is it repairable, or must I buy a new manifold?

Yes, I currently can control the total bypass flow to the spa, but I run it wide right now to try and get as much circulation and chlorine in the spa as possible.

It also occured to me that if I use a dual bypass to the spa (with check valves of course) and a Jandy 3-way valve (maybe even automated) I could meter the spa water, selecting some upstream water (before the SC-36) and some downstream water (After the SC-36) to be diverted to the spa for overflow. In this way, I can better control the amount of spa water and the amount of chlorine. Just an idea, and I'm sure it's a lot more complicated than it appears.