Ahhh .. well for one get rid of the 3/4", redo it in at least 1". Also try to avoid excessive 90 bends, if at all possible. Probably the best option is to go with 1" flex PVC, if not, then use 2 45's instead of a single 90 (and so on).
You wouldn't believe the difference switching from 3/4" to 1" made for me. Also I was using a short length of that ribbed 1" pond lining. I don't have any stats to back me up but I'm convinced that the ribbing puts too much friction into the equation, I would think that the flow through 1" ribbed pond tubing is equivalent to 3/4" tubing without.
I don't have the equations handy but flow through a cylinder increases exponentially with increases in diameter. E.g., comparing a 1" cylinder to a 2" cylinder, the total flow is 4x as much in the 2" as the 1", despite the diameter only being 2x as much. I guess my point is, don't discount the pipe diameter, it's significant.
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-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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