I am finally getting it. I think the parallel is better. I can also then use one or two if I put a valve in.

Now, if I split the line coming in to go to both bottom "in" lines in the solar panel.. you said to combine the top. Where then would they come out and back to the pool? Now, am I going to the ends where I had them capped off?

Plan to get this done tuesday. Thanks for any help.

Ellie