December 21, 2005

Pump Question

Q.>Hello Carolyn,

I am getting ready to install a new pond and I am trying to figure out what
size pump I need. I am going to have two different pools, a lower one and
higher one. The lower one is going to be about 3,000 gallons and the top one

(approx. 600 gal) will have a waterfall 2' wide, that flows directly into
the bottom one. What size pump do I need?

Another question, I have heard that an old piece of carpet works fine for a

underlayment for the liner. Is this true or will it eventually start
molding and smelling?



About the pump, it depends on how many fish and how big the fish will be. If they are koi, you need to double the pump and filter capacity for the amount of water you have. So shop for a 6,000-7,000 gph pump if there will be any koi in there. If only goldfish, no koi, you can install something that moves 2,000-3,000 gallons per hour. You didn't mention how high the pump will have to pump from the bottom pond to the waterfall. It makes a difference in buying a pump. If you are pushing water up 4-8' for instance, you need to take that into consideration (high head versus low head). I don't entirely understand these myself, but if you either go to the website, or talk to someone who knows about plumbing and pumps, they can tell you the difference and you can pick what you need.
Now for the underlayment. We used to use old carpet and newspapers for this, but have found the glue attractive to rodents and pests. So I don't recommend using it. If you need it because of tree roots or rocky ground, they sell actual underlayment for liners.


Happy Pondkeeping!

MacArthur Water Gardens

MacArthur Water Gardens
PO Box 3628
Alpharetta, GA 30023-3628

Posted by bfogle at December 21, 2005 02:18 PM