| Daffodil,
Direct drive pumps may be more economical, not sure.
I've got a Pondmaster 3600 GPH I'm using for filter and my waterfall. My new toy (P3 Kill A Watt EZ) says my pump costs me $12.83 per month to operate continuosly. It is a very strong magnetic drive pump with parts readily available. It's four years old: replaced impeller once and volute once.
Got it at Pondliner.com
Give your pump a try!!
fred |