The problem is, 20' is likely near the cutoff of the pump, so regardless of whether or not it's still moving a good volume of water, it'll be doing it very inefficiently.
__________________
Michael E. Robbins
M.A.Sc. Candidate, University of Toronto
12.1 GHz of AMD's finest (17.7 GHz total) crunching proudly for the AMDMB.com Killer Frogs
SETI BOINC: Dual Opteron 246s (Iwill DK8N) | XP2800+ (Shuttle SN41G2) | 3x XP2400+ (ASUS A7N266-vm)
SETI BOINC: 2x P4 2.8E (ASUS P4R800-vm) | Crunching 24/7
|