that's....the most confusing diagram I've ever seen, i can't imagine how you can have 2 semi-seperate loops and still have redundancy, you could run a serial setup with both pumps, the different gph of the pumps won't matter, you'll still get more flow than with either one alone (I've done flowrate tests with my 2 (different) pumps) and you'll retain some flow if one fails.
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feel free to icq/msn me, I'm always willing to toss around ideas.
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