Welcome to the forum!

Kelemvor is right on the money about the nature2 and pump....but I don't know anything about the electrical side of the question, so I'll leave that to those who do.

Regarding the trial portion of the forum, Ben (aka Pooldoc, the site's owner) will complete your registration soon, and then you'll have access to the remainder of the forum. In the meantime, though, you can log out and use the google search feature in my sig to search through the rest of the forum and archives for other information.